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

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Operating System (OS)
The advantage of a command processor running only built-in commands is:

the command set being common across different hardware configurations
the processing is much faster than would other-wise be the case when user defined commands are used
None of these
flexibility to the users in running lists of commands by simply collecting them in named batch command files
users can create system programs and run them as commands

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