Introduction:

The independence and objectivity of the internal audit function are paramount, especially when the CAE has had prior involvement in the area under review.

Scenario Analysis:

Option A: Previous consulting assignments may raise concerns but do not inherently impair independence if managed correctly.

Option B: A historical role in accounting functions is less problematic if sufficient time has passed and there is no ongoing influence.

Option C: Having been the payroll manager presents a direct conflict of interest, compromising the CAE's objectivity.

Option D: Reviews following consulting assignments are common practice and do not necessarily indicate a conflict.

Conclusion:

It is problematic for the CAE to provide assurance over payroll functions if they were previously the payroll manager, as this creates a clear conflict of interest and threatens audit objectivity.