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

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

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

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

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