Operating System (OS)
...... is used in operating system to separate mechanism from policy

None
Single level implementation
Multi level implementation
Two level implementation

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Operating System (OS)
Addressing modes

All of these
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.
defines the fundamental method of determining effective operand addresses
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these

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