Operating System (OS)
The virtual memory is

An extremely large main memory
An extremely large secondary memory
A type of memory used in super computer
An illusion of extremely large main memory

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Operating System (OS)
Addressing structure

defines the fundamental method of determining effective operand addresses
All of these
None of these
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.

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