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

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Operating System (OS)
The term "operating system" means

None of these
a set of programs which controls computer working
conversion of high level language into machine code
the way a computer operator works
the way a floppy disk drive operates

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