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單項(xiàng)選擇題

A virus scanner is running on a computer and scans all files currently in use. Why should a full scan be performed periodically?()

A. Files not accessed recently may contain a virus.
B. A full scan optimizes all files on the hard drive.
C. A full scan resets the archive bit on the file.
D. Active antivirus software only scans the C:\WINDOWS directory.

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