Operating System (OS)
Virtual Memory

allows multiple programs to reside in separate areas of core at the time.
None of these
consists of those addresses that may be generated by a processor during execution of a computation.
is a method of allocating processor time.
is a method of memory allocation by which the program is subdivided into equal portions, or pages and core is subdivided into equal portions or blocks.

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Operating System (OS)
A public key encryption system

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

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

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