Which of the following factors is most likely to affect the extent of documentation of the auditor's understanding of a client's system of internal controls?

Select one:

a. The industry and the business and regulatory environments in which the client operates

b. The relationship between management, the board of directors and external stakeholders

c. The degree to which information technology is used in the accounting function

d. The degree to which the auditor intends to use internal audit personnel to perform substantive tests