CompTIA A+ Question J-5

A technician is about to open a desktop workstation to replace a card. The technician shuts the computer down, opens it, grounds himself to the frame, and begins the task. Which of the following did the technician fail to do?

A. Power down the UPS.
B. Ground the card to the frame.
C. Turn the power switch off.
D. Disconnect the power cable.

Correct Answer: D