Operating System (OS)
What is the name of the technique in which the operating system of a computer executes several programs concurrently by switching back and forth between them?

None of these
Paging
Partitioning
Windowing
Multitasking

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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
None of these
they are initially stored on disk
they are memory resident
they are available on magnetic tapes

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Operating System (OS)
Data encryption

is mostly used by financial networks
None of these
cannot be used by private installations
is mostly used by public networks
is not necessary, since data cannot be intercepted

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