Which of the Following Statements Describes a Key Difference Between

Which of the following statements describes a key difference between advertising and publicity?

A) Publicity is more expensive on a cost-per-contact basis than advertising.
B) Advertising provides an immediate feedback loop, and publicity does not.
C) Advertising is usually directly paid, and publicity is usually indirectly paid.
D) Publicity is usually directly paid, and advertising is usually indirectly paid.