Operating System (OS)
Addressing structure

None of these
All of these
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.
are variations in the use of fundamental addressing structures, or some associated actions which are related to addressing.

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Operating System (OS)
Semaphores

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

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Operating System (OS)
The term "operating system" means

a set of programs which controls computer working
None of these
the way a floppy disk drive operates
the way a computer operator works
conversion of high level language into machine code

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