Which of the following is true of SITOR Mode B (FEC), in the presence of static crashes.

Correct Answer: Option D — FEC reduces the error rate by transmitting each character twice.

Mode B FEC improves reliability in high-interference environments by transmitting each character twice. The receiver compares the two transmissions; if the first is corrupted by static, the second may be valid. This redundancy significantly reduces the bit error rate without requiring a return path for error correction.