Which of the Following Is Not Essential to Engage Today's

Which of the following is not essential to engage today's customers using social media promotions?

A) Encourage and respond to comments and feedback, both positive and negative.
B) Create sweepstakes, contests, and deals that reward current and new customers.
C) Post relevant content about the benefits and uses of the product.
D) Send out a product sample to everyone who "likes" and "follows" the brand.
E) Supplement text with photos and videos.