194 PARTII Transaction Cycles and Business Proce 4. SEGREGATION OF FUNCTIONS Which, if any, of the following situations represent improper segregation of functions? a. The billing department prepares the customers' invoices, and the accounts receivable department posts to the customers' accounts. b. The sales department approves sales credit memos as the result of product returns, and subsequent adjustments to the customer accounts are per- formed by the accounts receivable department. c. The shipping department ships goods that have been retrieved from stock by warehouse personnel. d. The general accounting department posts to the general ledger accounts after receiving journal vou- chers that are prepared by the billing department. 5. CMA 688 5-2 Internal Controls Jem Clothes, Inc., is a 25-store chain concentrated in