The wave division system complement to chromatic dispersion mainly adopts the DCM compensation method. The following statements about DCM dispersion compensation, which is wrong?

The wave division system complement to chromatic dispersion mainly adopts the DCM compensation method. The following statements about DCM dispersion compensation, which is wrong?
A . Improper configuration of the DCM will result in degradation of the system signal-to-noise ratio.
B . 10G system with line fiber length less than 400km,
C . 652 DCI can be used to compensate
D . 655LEAF).
E . The DCM module is more likely to cause nonlinearity than the line transmission fiber, so it is necessary to strictly control its fiber-optic power.
F . Improper configuration of the DCM will result in degradation of the receiving end performance.

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Answer: B