A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through

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A CPU with interrupt-driven I/O is busy servicing a disk request. While the CPU is midway through the disk-service routine, another I/O interrupt occurs. 

a. What happens next? 

b. Is it a problem? 

c. If not, why not? If so, what can be done about it?

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