Operating System (OS)
You should choose sleep option when

When computer gets hanged frequently. Let it sleep for some time
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
You finish working and going to bed

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Operating System (OS)
The function(s) of the Syntax phase is(are)

to build a uniform symbol table
None of these
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.
to parse the source program into the basic elements or tokens of the language.
to build a literal table and an identifier table

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