When purchasing books on Amazon.com, customers are shown other books and a message saying "Customers who purchased (your book) also purchased . . ." This is an example of

When purchasing books on Amazon.com, customers are shown other books and a message saying "Customers who purchased (your book) also purchased . . ." This is an example of 



A. mass media advertising.

B. publicity.

C. public relations.

D. sales promotions.

E. direct marketing.


Answer: E. direct marketing


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