In ISO 9001:2015, the responsibility for managing the audit program lies with those overseeing the entire audit process rather than the Audit Team Leader. During the planning stage, before involving the Audit Team Leader, key actions for managing the audit program include:
1. Providing the Resources Needed: According to clause 7.1 (Resources), the audit program manager must ensure that the necessary resources are in place to conduct the audit effectively. This encompasses logistical support, personnel, and other required resources for the audit to proceed smoothly.
2. Reviewing Reports of Previous Audits: As per clause 9.2.2 (Internal Audit), it is essential to consider the results of previous audits to plan effectively for the upcoming audit. This helps identify areas that require particular attention, ensuring continuity and focusing on recurring issues or improvements since the last audit.
These actions ensure that the audit is thoroughly prepared and that there is continuity and focus on any areas that might need closer inspection. The other options, such as preparing the audit plan, assigning responsibilities, preparing checklists, and selecting the audit team members, generally fall under the duties of the Audit Team Leader once they are appointed and engaged in the planning process.

Explanation:
Identifying the source of information
Sampling available data
Gathering audit evidence
Verifying objective evidence
Evaluating evidence against the audit criteria
Making audit conclusions
Evaluating against the audit criteria
According to ISO 19011:2018, clause 6.4, the process of collecting and verifying information during an audit involves the following steps1:
Identifying the source of information: The audit team should identify the sources of information that are relevant to the audit objectives, scope and criteria. These sources may include documents, records, personnel, processes, activities, facilities, equipment, etc. The audit team should also determine the methods and tools for accessing and collecting the information, such as interviews, observations, document review, sampling, etc.
Sampling available data: The audit team should select a representative sample of the available data to verify the conformity and effectiveness of the management system. The sample size and selection method should be based on the audit objectives, scope and criteria, as well as the level of confidence and risk. The audit team should also consider the validity, reliability, relevance and sufficiency of the data.
Gathering audit evidence: The audit team should use the methods and tools identified in the previous step to collect audit evidence, which is the records, statements of fact or other information that are relevant to the audit criteria and verifiable. The audit team should record the audit evidence in a clear, concise and objective manner, using notes, checklists, photographs, audio or video recordings, etc.
Verifying objective evidence: The audit team should verify the accuracy, completeness and authenticity of the audit evidence collected. This may involve cross-checking different sources of information, confirming the identity and authority of the persons providing the information, examining the original documents or records, etc. The audit team should also identify any discrepancies, inconsistencies or gaps in the audit evidence.
Evaluating evidence against the audit criteria: The audit team should compare the audit evidence with the audit criteria to determine the extent of conformity and nonconformity. The audit team should also identify any opportunities for improvement, best practices, positive aspects or potential risks. The audit team should use professional judgement and apply the principles of auditing when evaluating the audit evidence.
Making audit conclusions: The audit team should consolidate the audit findings and evaluate the overall performance and effectiveness of the management system. The audit team should also consider the audit objectives, scope and criteria, as well as the context and expectations of the auditee and other interested parties. The audit team should provide a clear, concise and objective statement of the audit conclusions, which may include the degree of conformity, the achievement of the intended outcomes, the need for corrective actions, the suitability for certification, etc.
Evaluating against the audit criteria: The audit team should review the audit conclusions and ensure that they are consistent with the audit criteria and supported by sufficient and appropriate audit evidence. The audit team should also ensure that the audit conclusions are communicated to the auditee and other relevant parties in a timely and effective manner, using the agreed audit report format and distribution method.
References: ISO 19011:2018(en), Guidelines for auditing management systems

A first-party audit is an internal audit conducted by auditors who are employed by the organization being audited but who have no vested interest in the audit results of the area being audited1. The purpose of a first-party audit is to assess the conformity of the organization's quality management system to the requirements of ISO 9001 and to identify opportunities for improvement2. Therefore, the two auditors who would not participate in a first-party audit are:
*A. An auditor employed by an external consultancy organization: This auditor is not employed by the organization being audited, and therefore does not qualify as a first-party auditor. This auditor may be hired to conduct a second-party audit (if the external consultancy organization is a customer or supplier of the organization being audited) or a third-party audit (if the external consultancy organization is a certification body or registrar).
*F. An auditor from a customer: This auditor is not employed by the organization being audited, and therefore does not qualify as a first-party auditor. This auditor may be hired to conduct a second-party audit, as a customer is an interested party that has specific requirements for the organization being audited.
The other options are not correct, as they could participate in a first-party audit, as long as they are employed by the organization being audited and have no vested interest in the audit results of the area being audited:
*B. An auditor from an interested party: This auditor could be a first-party auditor, as long as the interested party is within the organization being audited. For example, an auditor from the finance department could audit the production department, as long as they are not involved in the production process or affected by its outcomes.
*C. An auditor trained in-house: This auditor could be a first-party auditor, as long as they are employed by the organization being audited and have no vested interest in the audit results of the area being audited. The source of the auditor's training is not relevant for determining the type of audit, as long as the auditor is competent and qualified to perform the audit.
*D. An auditor trained in the IRCA scheme: This auditor could be a first-party auditor, as long as they are employed by the organization being audited and have no vested interest in the audit results of the area being audited. The IRCA scheme is a professional certification scheme for auditors of management systems, which provides recognition of the auditor's competence and credibility3. However, being trained in the IRCA scheme does not determine the type of audit, as long as the auditor is competent and qualified to perform the audit.
*E. An auditor certified by IRCA: This auditor could be a first-party auditor, as long as they are employed by the organization being audited and have no vested interest in the audit results of the area being audited. Being certified by IRCA means that the auditor has met the requirements of the IRCA scheme and has demonstrated their competence and credibility as an auditor of management systems3. However, being certified by IRCA does not determine the type of audit, as long as the auditor is competent and qualified to perform the audit.
References: First Party Audits: The 5 Steps to Success - Sync Resource Inc, ISO 9001 Auditing Practices Group, IRCA - International Register of Certificated Auditors