A cash discount allows:A.the seller to secure prompt payment, and the buyer to pay a lower price per unit.B.the seller to secure prompt payment, but has no benefits for the buyer.C.the seller to demand payment in cash on demand (C.O.D.) upon receipt of goods.D.the buyer to pay a lower price per unit, but has no benefits for the seller.E.the buyer to always calculate the discount based on the delivery date.