Exam IIA-CIA-Part2 topic 4 question 99 discussion

During the quarterly review of the internal audit activity's performance, the chief audit executive (CAE) notes that actual engagement hours consistently exceed the budget. Which of the following strategies would most likely help the CAE address this problem?
The budget should consider time spent on similar engagements.
The budget should consider the proficiency of the assigned auditors.
The budget estimate should provide for unexpected delays.
The budget should be specific as to time for each work assignment.