Choice "D" is correct. The degree of access the independent auditor has to information about related parties provides no information regarding an internal auditor's competence.
Choice "a" is incorrect. In evaluating the work of internal auditors, the independent auditor should examine, on a test basis, documentary evidence of the work performed by internal auditors and should consider such factors as whether the scope of the work is appropriate, the audit plan is adequate, audit documentation adequately documents work performed, conclusions reached are appropriate in the circumstances, and any reports prepared are consistent with the results of the work performed.
Choice "c" is incorrect. When considering the competence of internal auditors, the independent auditor should inquire about the qualifications of the internal audit staff, including for example, consideration of the client's practices for hiring, training, and supervising internal audit staff. This includes inquiries as to the internal auditor's educational level and professional experience.
Choice "b" is incorrect. In evaluating the work of internal auditors, the independent auditor should examine, on a test basis, documentary evidence of the work performed by internal auditors and should consider such factors as whether the scope of the work is appropriate, the audit plan is adequate, audit documentation adequately documents work performed, conclusions reached are appropriate in the circumstances, and any reports prepared are consistent with the results of the work performed.