Mark and Amanda Carter own an appliance store and a restaurant. The appliance store sells merchandise on a 12-month installment plan; the restaurant sells only for cash. Which of the following statements are true? (More than one answer may be correct.)

a. The appliance store has a longer operating cycle than the restaurant.

b. The appliance store probably uses a perpetual inventory system, whereas the restaurant probably uses a periodic system. 

c. Both businesses require subsidiary ledgers for accounts receivable and inventory.

d. Both businesses probably have subsidiary ledgers for accounts payable.