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Which one is not a system tool?

A. Backup

B. Disk defragment

C. Virus scanning

D. All of the above

Answer: Option C

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Related Questions on Operating System

Identify false statement

A. You can find deleted files in recycle bin

B. You can restore any files in recycle bin if you ever need

C. You can increase free space of disk by sending files in recycle bin

D. You can right click and choose Empty Recycle Bin to clean it at once