At the Anode Target, How Much of the Energy from Filament

Multiple Choice

At the anode target, how much of the energy from filament electrons is lost as heat and how much will result in x-ray production.

A) 1% energy lost as heat ; 99% result in x-rays
B) 99% energy lost as heat; 1% result in x-rays
C) 0% energy lost as heat; 100% result in x-rays
D) 100% energy lost as heat; 0% result in x-rays