In which of the following circumstances would an auditor expect to find that an entity had implemented

Question:

In which of the following circumstances would an auditor expect to find that an entity had implemented automated controls to reduce risks of misstatement?
a. When errors are difficult to predict.
b. When misstatements are difficult to define.
c. When large, unusual, or nonrecurring transactions require judgment.
d. When transactions are high volume and recurring.