Operating System (OS)
The term "operating system" means

conversion of high level language into machine code
the way a floppy disk drive operates
a set of programs which controls computer working
the way a computer operator works
None of these

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Operating System (OS)
Assembler language

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

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