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

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Operating System (OS)
Thrashing

None of these
always occurs on large computers
is a natural consequence of virtual memory systems
can always be avoided by swapping
can be caused by poor paging algorithms

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