(Choose 1 answer)
Imagine that a certain modem can read 7,000 characters per second and that the time to rea the modem register is so short it can be ignored. If to run this modem using interrupt-driven I.character read requires an interrupt that takes 10 usec all-in to service. How many percent o the interrupt overhead cost?
A. 4% of the CPU
B. 93% of the CPU
C. 7% of the CPU
D. 96% of the CPU
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Ex 42
