Operating System (OS)
A linker

is not necessary with variable partitions
must be run after the loader
None of these
is not needed with a good compiler
creates a load module

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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

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

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