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

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Operating System (OS)
All of the following are task performed by the operating system except

Controlling the access that application program has to the CPU
Provides an interface for user to interact with computer
Managing hardware on the computer
Performing housekeeping task like file compression and disk defragmentation

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