According to ISO/IEC 27001:2022, which specifies the requirements for establishing, implementing, maintaining and continually improving an information security management system (ISMS), clause 5.2 requires top management to establish an information security policy that provides the framework for setting information security objectives1. Clause 6.2 requires top management to ensure that the information security objectives are established at relevant functions and levels1. Therefore, when verifying that the information security policy and objectives have been established by top management, an ISMS auditor should review relevant documents and records that demonstrate top management's involvement and commitment.
To verify that the mobile device policy and objectives are implemented and effective, an ISMS auditor should review relevant documents and records that demonstrate how the policy and objectives are communicated, monitored, measured, analyzed, and evaluated. The auditor should also sample and verify the implementation of the controls that are stated in the policy.
Three options for the audit trail that are relevant to verifying the mobile device policy and objectives are:
* Review the internal audit report to make sure the IT department has been audited: This option is relevant because it can provide evidence of how the IT department, which is responsible for managing the mobile devices and their security, has been evaluated for its conformity and effectiveness in implementing the mobile device policy and objectives. The internal audit report can also reveal any nonconformities, corrective actions, or opportunities for improvement related to the mobile device policy and objectives.
* Sampling some mobile devices from on-duty medical staff and validate the mobile device information with the asset register: This option is relevant because it can provide evidence of how the mobile devices that are used by the medical staff, who are involved in processing and storing residents' data, are registered in the asset register and have physical protection enabled. This can verify the implementation and effectiveness of two of the controls that are stated in the mobile device policy.
* Review the asset register to make sure all company's mobile devices are registered: This option is relevant because it can provide evidence of how the company's mobile devices that are within the ISMS scope are identified and accounted for. This can verify the implementation and effectiveness of one of the controls that are stated in the mobile device policy.
The other options for the audit trail are not relevant to verifying the mobile device policy and objectives, as they are not related to the policy or objectives or their implementation or effectiveness. For example:
* Interview the reception personnel to make sure all visitor and employee bags are checked before entering the nursing home: This option is not relevant because it does not provide evidence of how the mobile device policy and objectives are implemented or effective. It may be related to another policy or objective regarding physical security or access control, but not specifically to mobile devices.
* Review visitors' register book to make sure no visitor can have their personal mobile phone in the nursing home: This option is not relevant because it does not provide evidence of how the mobile device policy and objectives are implemented or effective. It may be related to another policy or objective regarding information security awareness or compliance, but not specifically to mobile devices.
* Interview the supplier of the devices to make sure they are aware of the ISMS policy: This option is not relevant because it does not provide evidence of how the mobile device policy and objectives are implemented or effective. It may be related to another policy or objective regarding information security within supplier relationships, but not specifically to mobile devices.
* Interview top management to verify their involvement in establishing the information security policy and the information security objectives: This option is not relevant because it does not provide evidence of how the mobile device policy and objectives are implemented or effective. It may be related to verifying that the information security policy and objectives have been established by top management, but not specifically to mobile devices.
References: ISO/IEC 27001:2022 - Information technology - Security techniques - Information security management systems - Requirements

Explanation
The two phrases that would apply to 'check' in the Plan-Do-Check-Act cycle for a business process are:
C: Verifying training
F: Auditing processes
C: This phrase applies to 'check' in the PDCA cycle because it involves measuring and evaluating the effectiveness of the training activities that were implemented in the 'do' phase. Training is an important aspect of information security awareness, education, and competence, which are required by clause 7.2 of ISO 27001:20221. Verifying training can help the organisation to assess whether the staff have acquired the necessary knowledge, skills, and behaviour to perform their roles and responsibilities in relation to information security. Verifying training can also help the organisation to identify any gaps or weaknesses in the training program and to plan for improvement actions.
F: This phrase applies to 'check' in the PDCA cycle because it involves examining and reviewing the performance and conformity of the processes that were implemented in the 'do' phase. Auditing is a systematic, independent, and documented process for obtaining objective evidence and evaluating it to determine the extent to which the audit criteria are fulfilled2. Auditing processes can help the organisation to verify whether the information security objectives and requirements are met, whether the information security controls are effective and efficient, and whether the information security risks are adequately managed. Auditing processes can also help the organisation to identify any nonconformities or opportunities for improvement and to plan for corrective or preventive actions.
References:
1: ISO/IEC 27001:2022 - Information technology - Security techniques - Information security management systems - Requirements, clause 7.2 2: ISO 19011:2018 - Guidelines for auditing management systems, clause 3.2

Explanation
The purpose of information security policy is best described as providing direction and support to the management regarding information security. An information security policy is a high-level document that defines the organization's vision, objectives, principles and responsibilities for information security. It also sets the scope and context of the information security management system and aligns it with the organization's strategy and culture. An information security policy does not document the analysis of risks or the search for countermeasures, nor does it make the security plan concrete or provide insight into threats and consequences.
These are tasks for other documents or processes within the information security management system.
ISO/IEC 27001:2022 defines information security policy as "policy that provides direction and support for information security in accordance with business requirements and relevant laws and regulations" (see clause
3.29). References: [CQI & IRCA Certified ISO/IEC 27001:2022 Lead Auditor Training Course], ISO/IEC
27001:2022 Information technology - Security techniques - Information security management systems - Requirements, What is Information Security Policy?