What methods of online promotions are commonly used?

Joyce wants to promote her online business, www.AdoptAPet.com. What methods of online promotions are commonly used? (Choose four):

A.
Givaways and sweepstakes

B.
Banner ads and banner exchange

C.
Spam, targeted email and opt-in email.

D.
Search engine placement

E.
Referrer sites

Explanation:
Givaways and sweepstakes are not as common as the other online promotion methods.