Which of the following statements about the main and backup channels of optical line protection is wrong?

Which of the following statements about the main and backup channels of optical line protection is wrong?
A . "Initial Difference Between Active and Standby Channels (dB)" ― It is used to set the reference value of the optical power difference between the active and standby channels of the board.
B. "Difference Threshold of Active and Standby Channels (dB)" – It is used to set the difference between the optical power of the active and standby optical ports of the board to a certain value, which is regarded as a signal failure (SF).
C. When the difference between the active and standby optical power exceeds the threshold, the optical switch will switch the service to the standby channel, and the set value supports query. The recommended setting is 5db.
D. If the current optical power difference between the active and standby channels exceeds the "main and standby channel difference threshold (dB)", the system will initiate protection switching.

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Answer: C