Operating System (OS)
Data encryption

is not necessary, since data cannot be intercepted
is mostly used by public networks
cannot be used by private installations
is mostly used by financial networks
None of these

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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
a permanent table which lists all key words and special symbols of the language in symbolic form
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

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Operating System (OS)
Addressing modes

defines the fundamental method of determining effective operand addresses
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
All of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
None of these

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