9B16 A
 In a switching power supply, the output voltage is controlled in the following manner:
A. Feeding the output back to either a DC/DC chopper or a Pulse Width Modulated inverter.
B. Using a ferro resonant reactor to control output.
C. Feeding the output back to a magnetic amplifier, which in turn controls the output voltage.
D. The error voltage is used to control SCR gates, which accomplish the regulation.
