Which of the following would be the most appropriate approach?

The internal audit activity is asked to review the effectiveness of controls around the disposal of chemical waste. However, the internal auditors on staff lack the necessary skills to conduct this review.

Which of the following would be the most appropriate approach?
A . An internal auditor who recently attended a three-day workshop on chemical waste disposal, and therefore has the most knowledge on the topic, should lead the engagement.
B. A team of available internal auditors should be assembled and should consult with an external nonaudit expert on chemical waste disposal to plan and conduct the engagement.
C. A team of the most knowledgeable auditors could be assembled and use the engagement work program from the previous year to gather additional insight regarding recommended audit procedures.
D. A nonaudit employee from the chemical disposal area may share his expertise with the audit team, provided the internal audit manager conducts a detailed review of all engagement work performed.

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Answer: D