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

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Operating System (OS)
A co-processor

Is relatively easy to support in software
Causes all processor to function equally
Is quite common in modern computer
Works with any application

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