A user's computer is running unusually slow, and they are seeing frequent, unwanted pop-up advertisements. A support technician suspects a malware infection. What is the most appropriate FIRST action to take?
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A
Disconnect the computer from the network to prevent potential spread.
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B
Update the antivirus definitions and perform a full system scan.
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C
Reinstall the operating system to ensure the malware is completely removed.
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D
Check for and install the latest operating system security patches.