Operating System (OS)
Under virtual storage,

a single program is processed by two or more CPUs
two or more programs are stored concurrently in primary storage
interprogram interference may occur
None of these
only the active pages of a program are stored in primary storage

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

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