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 partly in primary memory and partly on disk
None of these
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 Storage Assignment is (are)

to assign storage to all temporary locations that are necessary for intermediate results.
None of these
All of these
to assign storage to literals, and to ensure that the storage is allocate and appropriate locations are initialized.
to assign storage to all variables referenced in the source program.

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