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

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

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Operating System (OS)
Addressing structure

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

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