Operating System (OS)
A critical region is

one which is enclosed by a pair of P and V operations on semaphores
none is the above
a program segment that has not been proved bug-free
a program segment that often causes unexpected system crashes
a program segment where shared resources are accessed

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Operating System (OS)
Addressing structure

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.
defines the fundamental method of determining effective operand addresses
All of these
None of these

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