A technician is working on a laptop and a key on the keyboard is not responding as it should. What is a possible solution for this situation?

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Question:
A technician is working on a laptop and a key on the keyboard is not responding as it should. What is a possible solution for this situation?

Clean with compressed air.
Update all security apps.
Recharge the battery.
Verify that the Num Lock key is not depressed.

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