Explanation:

- Examine the scope of internal auditor’s work: This is crucial to understand the extent and boundaries of the internal audit work.

- Examine the system of supervising, review and documentation of internal auditor’s work: This helps ensure the internal audit process is properly managed and reliable.

- Adequacy of related audit programme: It’s important to assess this to ensure that the audit programme is comprehensive and effective.

- All of the above: All these checks are necessary for an independent auditor to confidently rely on the work of internal auditors.