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

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

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Operating System (OS)
Addressing structure

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.
defines the fundamental method of determining effective operand addresses
All of these

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