Operating System (OS)
The advantage of a command processor running only built-in commands is:

flexibility to the users in running lists of commands by simply collecting them in named batch command files
None of these
the command set being common across different hardware configurations
the processing is much faster than would other-wise be the case when user defined commands are used
users can create system programs and run them as commands

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Operating System (OS)
System maintenance:

is necessary on all systems, regardless of how good
is not required if the system is well written
always requires several programs
is usually not necessary
None of these

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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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