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

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

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

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Operating System (OS)
Thrashing

always occurs on large computers
is a natural consequence of virtual memory systems
can be caused by poor paging algorithms
None of these
can always be avoided by swapping

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