Which of the following is a valid electrical safety precaution when working on a computer or display with expo

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Which of the following is a valid electrical safety precaution when working on a computer or
display with exposed, potentially energized parts?

A.
Use only metal screw drivers or fingers as needed to connect or disconnect cables.

B.
Always wear an ESD wrist or heel strap when working on plugged in systems.

C.
Be very careful handling the logic board or power supply while the computer is plugged
in.

D.
Remove rings, watches, necklaces, metal-rimmed eyewear and other metallic articles
before working on the computer.

Explanation:

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