Which of the following is most likely to be considered a control weakness?

Which of the following is most likely to be considered a control weakness?
A . Vendor invoice payment requests are accompanied by a purchase order and receiving report.
B. Purchase orders are typed by the purchasing department using prenumbered forms.
C. Buyers promptly update the official vendor listing as new supplier sources become known.
D. Department managers initiate purchase requests that must be approved by the plant superintendent.

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Answer: C