Operating System (OS)
You should choose sleep option when

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
The computer is tired after working for the whole day
You finish working and going to bed

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Operating System (OS)
Thrashing can be avoided if

the speed of I/O processor is increased
the pages, belonging to the working set of the programs, are in main memory
the speed of CPU is increased
None of these
All of these

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