Which feature allows the fuser in the HP LaserJet Enterprise M4555 MFP to heat up to optimum
temperature from Sleep mode almost immediately?

A.
A quick-heating ceramic element is used instead of a lamp.

B.
Reflective shielding is installed, which reduces the amount of heat that is wasted.

C.
The dual-element corona wire uses both elements for quick heating, and then resumes singleelement use for fusing.

D.
A reduced-capacity heating charge is retained while in Sleep mode

Explanation:

Reference:
http://www.computersuppliesultd.com/Peripherals/ce738a.pdf (see more energy efficient)