Operating System (OS)
The purpose of run command in start menu is to

Open internet explorer
Start programs
Open windows explorer
Launch internet browser

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

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