Ben recently purchased a cellular telephone. The manufacturer provided a form and a special code with the telephone's packaging. Ben compleated the form, copied his sales receipt, and mailed these items back to the manufacturer along with the part of the packaging that contained the special code. Within six weeks, Ben received a $50 check from the telephone manufacturer. What type of sales-promotion technique was used?
A. Warranty
B. Coupon
C. Sweepstakes
D. Rebate
Answer: D