79. When you try to turn computer on, you notice that the computer won’t activate. The monitor is blank and the fan

on the power supply is not active. Turning the switch off and then back on makes no difference. What is the most
likely cause of this problem?
A. Both the fan on the power supply and the video card are bad.
B. The computer is unplugged.
C. The BIOS on the motherboard needs to be upgraded.
D. The monitor is malfunctioning.�