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

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Operating System (OS)
Multiprogramming systems:

execute each job faster
are used only on large mainframe computers
execute more jobs in the same time period
are easier to develop than single programming system
None of these

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