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

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Operating System (OS)
Object code

None of these
must be "loaded" before execution
is the output of compilers, but not assemblers
is ready to execute
must be rewritten before execution

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