Operating System (OS)
Uniform Symbols Table

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

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Operating System (OS)
The Memory Buffer Register (MBR)

contains the address of the memory location that is to be read from or stored into.
is a group of electrical circuits (hardware), that performs the intent of instructions fetched from memory.
is a hardware memory device which denotes the location of the current instruction being executed.
None of these
contains a copy of the designated memory location specified by the MAR after a "read" or the new contents of the memory prior to a "write".

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