Operating System (OS)
Swapping

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

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

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