What Is the Best Control to Mitigate the Threat of Paying

Multiple Choice

What is the best control to mitigate the threat of paying prices that are too high for goods ordered?

A) Require the receiving department to verify the existence of a valid purchase order.
B) Use only approved suppliers and solicit competitive bids.
C) Only pay invoices that are supported by the original voucher package.
D) Use bar-code technology to eliminate data entry errors.