Operating System (OS)
Object code

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

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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

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
they are memory resident

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