The sales department administrative assistant has been assigning phone order sales to her brother-in-law, a company sales person. Company policy is to pay commissions only on orders directly received by sales people, not on orders received over the phone. The resulting fraudulent commission payments might best have been prevented by requiring that

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ASales commission statements be supported by sales order forms signed by the customer and approved by the sales manager

BSales order forms be prenumbered and accounted for by the sales department manager

CSales orders and commission statements be approved by the accounting department

DDisbursement vouchers for commission payments be reviewed by the internal audit