Operating System (OS)
Scheduling is

unrelated to performance consideration
None of these
not required in uniprocessor systems
the same regard-less of the purpose of the system
allowing jobs to use the processor

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

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