Which of the following description of the 100G mixed transmission system is wrong?

Which of the following description of the 100G mixed transmission system is wrong?
A . Coherent and non-coherent signals (10G and 40G ODB will affect each other, resulting in a sharp drop in performance, and isolation bands are necessary)
B. 40G DQPSK and coherent signals will not affect each other without isolation band
C. 10G starts from a short wavelength, and the isolation band can be filled with 40G DQPSK wavelength
D. The cost of mixed transmission is related to the number of transmission spans and the width of the isolation bandwidth, and has nothing to do with the FEC encoding method

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Answer: D