An advantage of coupons as a sales promotional tool is that . . .

	A.	it makes it possible to give a discount to a price-sensitive consumer while still selling the product at full price to other consumers.
	B.	a coupon-redeeming consumer is often a competitive brand user, so the coupon can induce brand switching.
	C.	in-package coupons can induce repeat purchases.
	D.	all of these are advantages of coupons as a sales promotional tool.