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单项选择题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.

  • A

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