Operating System (OS)
A critical region is

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

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Operating System (OS)
The Storage-to-Storage instructions

have both their operands in the main store.
which perform indicated operations on two fast registers of the machine and have the result in one of the registers
All of these
None of these
which perform an operation on a register operand and an operand which is located in the main store, generally leaving the result in the register, expect in the case of store operation when it is also

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