Which of the Following Is True About Bloggers in Promoting

Which of the following is true about bloggers in promoting a firm's product?

A) When a blogger offers an endorsement for a product,it must not be disclosed by a firm.
B) Bloggers are either directly or indirectly paid by firms for their writing.
C) Identifying influential bloggers who have the attention of target customers can be helpful.
D) Bloggers cannot give negative reviews about a firm's products.
E) Bloggers collect promotion data and help firms in preparing their press releases.