Which of the following statements about online sales promotions is true?
a. Internet sales promotions are more effective and cost-efficient at generating responses than their off-line counterparts.
b. One of the few types of sales promotion that cannot be used online is sampling.
c. Online coupons have lower redemption rates than off-line coupons.
d. Loyalty marketing programs are ineffective when used at Web sites to encourage traffic.
e. There is no way for a marketer to build long-term, mutually beneficial relationships with customers online.
ANSWER: a