What Is the Major Difference Between a Selling Agent and a Manufacturer's

What is the major difference between a selling agent and a manufacturer's representative?

A) A selling agent represents several manufacturers, but a manufacturer's representative represents only one manufacturer.
B) A selling agent is paid on a commission basis, but a manufacturer's representative is remunerated on an annual basis.
C) A selling agent serves as an independent marketing department for a manufacturer, while a manufacturer may hire several manufacturers' representatives.
D) A selling agent is paid on an annual basis, but a manufacturer's representative is paid on a commission basis.