Operating System (OS)
To save your computer from viruses you will do

Make physical safe for the removal disk
Scan the removable disk before using it
All of these
Install antivirus software and run it

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

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 build a literal table and an identifier table
to parse the source program into the basic elements or tokens of the language.

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