The probability that a single bit will be in error on a typical public telephone line using 4800 bps modem is 10 to the power -3. If no error detection mechanism is used, the residual error rate for a communication line using 9-bit frames is approximately equal to

A. 0.003

B. 0.009

C. 0.991

D. 0.999

E. None of the above

Answer: Option B

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