Operating System (OS)
Memory management is :

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

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Operating System (OS)
Addressing modes

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
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
All of these

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