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

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Operating System (OS)
A Processor

is a sequence of instructions
is typically characterized by interactive processing and time of the CPU
is a device that performs a sequence of operations specified by instructions in memory.
None of these
is the device where information is stored

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