Popular Methods of Covert Marketing Include ________

Popular methods of covert marketing include ________.

A) actors posing as customers telling people the product benefits and giving them a chance to try the product
B) paying bartenders for praising brands of alcoholic beverages and recommending them to customers
C) paying employees to pose as customers online and spread positive word-of-mouth about the product
D) disguising emails as urgent or personal thank-you notes
E) all of the above