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Imagine that a certain modem can read 7,000 characters per second and that the time to read a character to the modem register is so short it can be ignored. If to run this modem using interrupt-driven I/O and each character read requires an interrupt that takes 10 µsec all-in to service. How many percent of the CPU is available to do other work?A.93% of the CPUB.7% of the CPUC.4% of the CPUD.96% of the CPU

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