Operating System (OS)
All of the following are task performed by the operating system except

Provides an interface for user to interact with computer
Controlling the access that application program has to the CPU
Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation

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Operating System (OS)
You should choose sleep option when

The computer is tired after working for the whole day
You are leaving for a very short time and want to resume you work shortly
When computer gets hanged frequently. Let it sleep for some time
You finish working and going to bed

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