What Is the Nature of the "Paid" Aspect of Advertising

What is the nature of the "paid" aspect of advertising?

A) Fees are paid for space or time in the medium.
B) Fees are paid to salespeople as either salaries or commissions.
C) Fees are paid to creative arts contributors, but there is no direct payment to media.
D) There is a wide range of fees paid depending upon the promotion selected.
E) The primary costs are now associated with communication through mail, telephone, or the Internet.