Operating System (OS)
You should choose sleep option when

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

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Operating System (OS)
Virtual Memory

allows multiple programs to reside in separate areas of core at the time.
is a method of allocating processor time.
consists of those addresses that may be generated by a processor during execution of a computation.
None of these
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.

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