Which of the following steps should a technician take FIRST to prevent an electrical hazard when repairing a PC?

Which of the following steps should a technician take FIRST to prevent an electrical hazard when repairing a PC?
A . Put on an ESD strap.
B . Place components on an ESD mat
C . Disconnect the power before servicing the PC
D . Place the PC on a grounded work bench

Answer: C

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