What is a main difference between the processor on a laptop and on a desktop?

A.
Power consumption and heat production.

B.
Mobility and clock speed.

C.
L2 Cache and clock speed.

D.
Power consumption and front side bus speed.

E.
L2 Cache and front side bus speed.

Explanation:
The main difference is power consumption to save the batteries and heat production because of
the limited space for cooling inside a laptop (and of course power consumption of larger fans)