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

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Operating System (OS)
Swapping

None of these
allows many programs to use memory simultaneously
allows each program in turn to use the memory
does not work with overlaying
works best with many small partitions

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