Convective Heat Sources Differ from Radiant Heat Sources in What

Convective heat sources differ from radiant heat sources in what way?

A) Convective heat sources rely on the movement of air, matter, or liquid around or past the body, and radiant heat sources do not require movement of anything.
B) Convective heat sources do not require movement, and radiant heat sources rely on the movement of air, matter, or liquid around or past a body.
C) Radiant heat sources heat by conduction, and convective heat sources use fans.
D) Radiant sources heat or cool, and convective sources only cool.