a$)$ A cash discount is extended to reward the buyer for purchasing large quantities of goods.

b$)$ A purchase discount refers to a cash discount as seen from the seller's viewpoint.

c$)$ A sales discount refers to a cash discount as seen from the buyer's view.

d$)$ In a perpetual inventory system, a sales discount is recorded as a reduction of sales revenue.

e$)$ In a perpetual inventory system, a purchase discount is recorded as a reduction of merchandise inventory.