Answer:
A mail-in rebate and C. Coupon
Step-by-step explanation:
Mail-in rebate is one of the ways to get discounts for your purchases. As the name says, The customer can get a refund after a purchase following certains steps which will include sending information, like the invoice of what you bought for example, via mail. It is not a very fast process in comparison to coupons as we have to wait for the mail-in rebate, then fill the forms and other steps just to send everything back and wait for the cashback. Things are different with coupons which can be easily got on magazines and then it is just necessary to go to the respective store with the coupons to get the discount or payback right away.