Operating System (OS)
Whenever you move a directory from one location to another

The directory is moved the source file is not moved
All the subdirectory inside that directory are moved
All files inside the directory are moved
Both A and B

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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 initially stored on disk
they are partly in primary memory and partly on disk
they are memory resident
they are available on magnetic tapes

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