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 memory resident
they are partly in primary memory and partly on disk
they are available on magnetic tapes
they are initially stored on disk

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Operating System (OS)
The disadvantages of "Compile and Go" loading scheme is (are):

All of these
it is necessary to retranslate the user's program deck every time it is run.
it is very difficult to handle multiple segments, especially if the source programs are in different languages, and to produce orderly modular programs.
a portion of memory is wasted because the core occupied by the assembler is unavailable to the object program.
None of these

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