Operating System (OS)
Save operation means

Put data into secondary storage
Put data into processor
Put data into monitor
Put data into internal memory

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

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