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

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Operating System (OS)
Seeks analysis

is used for analyzing control-unit busy problems
is used for analyzing paging problems
is used for analyzing device busy problems
None of these
is only shown on real-time displays

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