Operating System (OS)
A public key encryption system

does not encode the data before transmitting it
allows only the correct sender to decode the data
allows only the correct receiver to decode the data
None of these
allows anyone to decode the transmission

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

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