Operating System (OS)
A critical region is

none is the above
one which is enclosed by a pair of P and V operations on semaphores
a program segment that has not been proved bug-free
a program segment where shared resources are accessed
a program segment that often causes unexpected system crashes

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Operating System (OS)
Uniform Symbols Table

None of these
contains all constants in the program
a permanent table which lists all key words and special symbols of the language in symbolic form
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
a permanent table of decision rules in the form of patterns for matching with the uniform symbol table to discover syntactic structure

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