Operating System (OS)
Uniform Symbols Table

contains all constants in the program
consists of a full or partial list of the token's as they appear in the program. Created by Lexical analysis and used for syntax analysis and interpretation
None of these
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure
a permanent table which lists all key words and special symbols of the language in symbolic form

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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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