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