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

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Operating System (OS)
Assembler language

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

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