What is the primary factor that determines the depth and breadth of audit follow-up?

A manufacturing process could create hazardous waste at several production stages, from raw materials handling to finished goods storage. If the objective of a pollution prevention audit engagement is to identify opportunities for minimizing waste, in what order should the following opportunities be considered?
1. Recycling and reuse.
2. Elimination at the source.
4. Energy conservation.
5. Recovery as a usable product Treatment.

When assessing the risk associated with an activity, an internal auditor should:

Which of the following must an auditor establish in order to demonstrate that fraud has occurred?

During a routine audit of a customer service hotline, an internal auditor noticed that an unusually high number of customer complaints pertained to payments not being applied to the customers' accounts.
Which of the following would most likely be the reason for the high volume of complaints?