Operating System (OS)
In which addressing mode the operand is given explicitly in the instruction?

index mode
absolute mode
None of these
indirect mode
immediate mode

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Operating System (OS)
A critical region is

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

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