Which of the following security incident has the most influential?

Which of the following security incident has the most influential?
A . Barbaric work causes the cabinet door to be deformed and cannot be closed.
B . The cable connector of the climbing operation falls into the frame and poses a safety hazard.
C . Inadvertently dropping the tool, causing damage to the cooling fan blade
D . Power supply short circuit caused by DC power distribution operation in the equipment room

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Answer: D