Confidentiality is one of the principles of audit conduct that auditors should adhere to when performing audits. Confidentiality means that auditors should exercise discretion in the use and protection of information acquired in the course of their duties3. Auditors should respect the intellectual property rights of the auditee and other parties involved in the audit, and should not disclose any information that is sensitive, proprietary, or confidential without prior approval from the auditee or other authorized parties3. Auditors should also obtain the auditee's permission before using a camera or recording equipment during an audit, as these devices may capture confidential information or infringe on the privacy of individuals3. Therefore, these two options correctly state the function of confidentiality in an audit. The other options are either incorrect or irrelevant to confidentiality. For example, auditors are not forced by regulatory requirements to maintain confidentiality in an audit, but rather by ethical obligations and contractual agreements3. Observers in an audit team can access confidential information if they have signed a confidentiality agreement and have been authorized by the auditee3. Audit information can be used for improving personal competence by the auditor only if it does not compromise confidentiality or conflict with other interests3. As an auditor is always accompanied by a guide, there is still a risk to the auditee's sensitive information if the guide is not trustworthy or authorized to access such information3. References: ISO 19011:2018 - Guidelines for auditing management systems

Explanation
Confidentiality is one of the Confidentiality, Integrity, Availability (CIA) principles of information security that states that only authorized parties should have access to information assets. Confidentiality protects the secrecy and privacy of information from unauthorized disclosure or exposure. Often, people do not pick up their prints from a shared printer. This can affect the confidentiality of information, as anyone who passes by the printer can see or take the printed documents that may contain confidential or personal information. This can lead to information leakage, identity theft, fraud, or other malicious activities. Therefore, the correct answer is C. References: ISO/IEC 27000:2022, clause 3.8; How & Where to Print Sensitive Documents on a Shared Printer.

Explanation
The purpose of a follow-up audit is to verify the completion and effectiveness of corrective actions taken by the auditee in response to the nonconformities identified in a previous audit1. A follow-up audit is a type of audit that is conducted after an initial audit, and it focuses on the specific areas where nonconformities were found and corrective actions were agreed upon2. A follow-up audit can be conducted as a separate audit or as part of a scheduled audit, depending on the nature and severity of the nonconformities and the audit programme objectives3.
The other options are not the purpose of a follow-up audit, but rather the purpose of other types of audits. For example:
*Option A is the purpose of a performance audit, which is a type of audit that evaluates the effectiveness of the management system in achieving its intended results4.
*Option B is the purpose of a compliance audit, which is a type of audit that verifies the conformity of the management system with the specified requirements, such as the ISMS objectives5.
*Option C is the purpose of a process audit, which is a type of audit that examines the inputs, activities, outputs, and interactions of a specific process within the management system, such as the risk treatment process.
References: 1: ISO 19011:2018, 6.7; 2: ISO 19011:2018, 3.7; 3: ISO 19011:2018, 5.5.2; 4: ISO 19011:2018,
3.6; 5: ISO 19011:2018, 3.5; : ISO 19011:2018, 3.4; : ISO 19011:2018; : ISO 19011:2018; : ISO 19011:2018;: ISO 19011:2018; : ISO 19011:2018; : [ISO 19011:2018]

According to ISO/IEC 27001:2022, clause 8.2.1, the organization shall ensure that access to information and information processing facilities is limited to authorized users based on the access control policy and in accordance with the business requirements of access control2. Therefore, only employees with a business need-to-know are allowed to access highly confidential files, and not contractors, non-employees or employees with signed NDA. References: ISO/IEC 27001:2022 Lead Auditor (Information Security Management Systems) | CQI | IRCA