A university does not have a centralized receiving function for departmental purchases of books, supplies, and equipment. Which of the following controls will most effectively prevent payment for goods not received, if performed prior to invoice payment?

a. Vendor invoices should be approved by a departmental supervisor other than the employee ordering the goods.
b. Invoices over a specified amount should be approved by the vice president of finance.
c. Names and addresses on vendor invoices should be compared to a list of department-authorized vendors.
d. Vendor invoices shoul be matched with department purchase orders.