Technician a Says a Pulse-Width Modulation of 50% Means the Valve

Multiple Choice

Technician A says a pulse-width modulation of 50% means the valve is energized 50% of the time and de-energized 50% of the time. Technician B says if an EPC pulse-width modulation value is 25%, that means that line pressure is increased by 25%. Who is correct?

A) Technician A
B) Technician B
C) Both A and B
D) Neither A nor B