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.
Answer: D
Explanation:
Rings, watches, necklaces or any metallic wearables should be removed because metal will disturb the inner circuitry and the static charge will transfer to the sensitive parts of the computer.
Explanation: http://mdex-nn.ru/uploads/imac12.pdf (page 3, electrical safety precautions