Operating System (OS)
Which type of command requires additional files to perform specific operations?

Valuable commands
External commands
Internal commands
Primary commands

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

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