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.
performs indicated operations on two fast registers of the machine and leave the result in one of the registers.
None of these
All of these

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Operating System (OS)
Semaphores

are used to do I/O
synchronize critical resources to prevent contention
synchronize critical resources to prevent deadlock
are used for memory management
None of these

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