Which of the Following Statements About Online Sales Promotions Is

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 offline counterparts.
B) One of the few types of sales promotion that cannot be used on-line is sampling.
C) Online coupons are having the same problem with diminishing redemption rates as 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.