Operating System (OS)
...... runs on a computer hardware and serves as a platform for other system to run on

Operating system
Application system
System software
All of above

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Operating System (OS)
Addressing structure

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

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