Operating System (OS)
You should choose sleep option when

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

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Operating System (OS)
Process is

program in High level language kept on disk
contents of main memory
None of these
a program in execution
a job in secondary memory

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