Operating System (OS)
The LRU algorithm

pages out pages that have been used recently
None of these
pages out the first page in a given area
pages out pages that have not been used recently
pages out pages that have been least used recently

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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

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

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