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

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

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Operating System (OS)
Assembler language

is usually the primary user interface
is quite different from the SCL interpreter
None of these
is a mnemonic form of machine language
requires fixed-format commands

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