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

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

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.
consists of a program and relevant information for its relocation.
can itself performs the relocation of its address-sensitive portions.
All of these
None of these

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