$(17"$

A company's purchasing department creates purchase orders based on electronic requests sent by operations. These requests are approved by operations, and no further approvals are required to place a purchase order. Purchasing clerks key the order information, including vendor names and prices, into the purchasing system based on the electronic requests. Which of the following is the best control to ensure that orders are entered accurately?

A$.$ Approvals from management in operations are sent to clerks along with the order requests, which are then filled.

B$.$ Clerks use preformatted screens, which show the clerks the type of information expected, but do not restrict input.

C$.$ The purchasing system compares vendor information and prices entered by the clerks to master vendor and pricing data and rejects variances.

D$.$ A hash total of the total quantity of all items entered by purchasing clerks each day is compared to the total quantity of all the items originated by operations personnel.