Operating System (OS)
Trojan-Horse programs

None of these
do not usually work
usually are immediately discovered
are legitimate programs that allow unauthorized access
are hidden programs that do not show up on the system

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Operating System (OS)
The function(s) of the Syntax phase is(are)

to build a literal table and an identifier table
to recognize the major constructs of the language and to call the appropriate action routines that will generate the intermediate form or matrix for these constructs.
to build a uniform symbol table
None of these
to parse the source program into the basic elements or tokens of the language.

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