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 initially stored on disk
they are memory resident
None of these

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Operating System (OS)
A Processor

is the device where information is stored
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.
is a sequence of instructions
None of these

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