Operating System (OS)
The LRU algorithm

pages out pages that have been used recently
None of these
pages out pages that have been least used recently
pages out the first page in a given area
pages out pages that have not been used recently

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Operating System (OS)
Addressing structure

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.
None of these
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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