Operating System (OS)
Which of the following systems software does the job of merging the records from two files into one?

Documentation system
None of these
Utility program
Networking software
Security software

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

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