Brands Should Be Cautious with Promotions on Group Buying Sites

Brands should be cautious with promotions on group buying sites because:

A) damage to brand equity among mid- to high-range consumers
B) overuse can cheapen the brand image
C) traffic triggered by such deals comes mostly from low-loyalty buyers
D) buyers are not overly likely to return to the brand in the absence of deals.
E) all the above