Operating System (OS)
Most of the microcomputer's operating systems like Apple DOS, MS DOS and PC DOS etc. are called disk operating systems because

None of these
they are partly in primary memory and partly on disk
they are available on magnetic tapes
they are memory resident
they are initially stored on disk

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

to parse the source program into the basic elements or tokens of the language.
to build a uniform symbol table
to build a literal table and an identifier table
None of these
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.

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