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

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Operating System (OS)
Trojan-Horse programs

are hidden programs that do not show up on the system
are legitimate programs that allow unauthorized access
do not usually work
None of these
usually are immediately discovered

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