单选题A virus scanner is running on a computer and scans all files currently in use. Why should a full scan be performed periodically?（）AFiles not accessed recently may contain a virus.BA full scan optimizes all files on the hard drive.CA full scan resets the archive bit on the file.DActive antivirus software only scans the C:/WINDOWS directory.
单选题
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.
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