Operating System (OS)
Which of the following is not essential to shut down your computer?

Save all opened files
Switch off monitor
Cut off the power supply
Close all running applications

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

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