Which of the Following Is the Best Approach for Obtaining

Which of the following is the best approach for obtaining feedback from engagement clients regarding the quality of internal audit work?

A) Ask questions during the exit interviews and send copies of the documented responses to the clients.
B) Call engagement clients after the exit interviews and send copies of the documented responses to the clients.
C) Distribute questionnaires to selected engagement clients shortly before preparing the internal audit annual activity report.
D) Provide questionnaires to engagement clients at the beginning of each engagement and request that the clients complete and return them after the engagements.