Which of the following differentiates between passive and active cooling?

Which of the following differentiates between passive and active cooling?

A.
Active cooling allows heat to be transferred to a heat sink and distributed in a radiant fashion.

B.
Passive cooling allows heat to be radiated away from the CPU by dispersion.

C.
Active cooling does not require a thermal compound to sit between the CPU and the heat sink.

D.
Passive cooling occurs when cool air or a liquid medium is passed across a surface of the CPU.