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
they are initially stored on disk
None of these
they are available on magnetic tapes

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Operating System (OS)
Memory

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

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