Which of the following best defines an audit opinion?

During an audit of a contract for computer security, a governmental auditor finds that a contractor has developed a system that could be the most advanced in the industry. If it seems that the contractor is charging the government for developmental cost of a system that might be sold to other organizations, what is the auditor's best course of action?

A retail company uses a computer program that matches electronic vendor invoices with the applicable purchase orders and receiving information, which are also maintained electronically.
If an invoice does not match the other items within predefined ranges, a report is generated and sent to the accounts payable department for further investigation. All of the applicable documents are electronically marked, cross-referenced, and retained in open files. Both an integrated test facility and a systems control audit review file (SCARF) have been included in the system.
An auditor wants to determine the extent to which items are not matched at year end and to investigate the potential causes of the unmatched items. Which of the following audit procedures would be most effective in determining the items to investigate?

In reviewing the appropriateness of the minimum quantity level of inventory established by a department, an auditor would be least likely to consider:

Which of the following conditions is the strongest indicator of possible fraud?