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)
The function(s) of the Syntax phase is(are)

to build a literal table and an identifier table
None of these
to parse the source program into the basic elements or tokens of the language.
to build a uniform symbol table
to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.

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