Operating System (OS)
Link encryption

is used only to debug
is less secure than end-to-end encryption
None of these
is more secure than end-to-end encryption
can not be used in a public network

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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 memory resident
they are available on magnetic tapes
they are initially stored on disk

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