Operating System (OS)
Addressing modes

None of these
defines the fundamental method of determining effective operand addresses
All 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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Operating System (OS)
Memory management is :

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

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