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
None of these
they are memory resident
they are initially stored on disk

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Operating System (OS)
A relocate program form is one which

can itself performs the relocation of its address-sensitive portions.
cannot be made to execute in any area of storage other than the one designated for it at the time of its coding or translation.
None of these
consists of a program and relevant information for its relocation.
All of these

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