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13.1 Which internal control procedure would be most cost-effective in dealing with the fol lowing expenditure cycle threats? a. A purchasing agent orders materials from a supplier that he partially owns. b. Receiving-dock personnel steal inventory and then claim the inventory was sent to the warehouse. c. An unordered supply of laser printer paper delivered to the office is accepted and paid for because the "price is right." After all of the laser printers are jammed, how ever, it becomes obvious that the "bargain" paper is of inferior quality. d. The company fails to take advantage of a 1% discount for promptly paying a vendor invoice