Operating System (OS)
The register or main memory location which contains the effective address of the operand is known as

scratch pad
None of these
pointer
special location
indexed register

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Operating System (OS)
A critical region is

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

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