Operating System (OS)
Operating system

All of these
provides a layered, user-friendly interface
None of these
links a program with the subroutines it references
enables the programmer to draw a flowchart

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

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