Operating System (OS)
Memory management is :

not used on multiprogramming systems
None of these
not used in modern operating system
critical for even the simplest operating systems
replaced with virtual memory on current systems

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Operating System (OS)
Addressing structure

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

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