The correct answer is D. Chassis ground.
A chassis ground is a conductive path that connects the metal chassis of an electronic device to the earth. This helps to protect the user from electrical shock in the event of a fault.
Option A, an AC outlet, is not a good ground for a conductive work bench because it is not always connected to the earth. Option B, ground to bend, is not a good ground because it is not a reliable connection to the earth. Option
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