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

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

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Operating System (OS)
Addressing modes

None of these
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these
defines the fundamental method of determining effective operand addresses

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