If a ROADM site adopts WSS+RMU configuration, which of the following impacts on SOM is wrong?

If a ROADM site adopts WSS+RMU configuration, which of the following impacts on SOM is wrong?
A . If RMU is used locally to add wavelengths and has optical amplifiers, the OSNR value of the wavelength in the through direction detected by the SOM will deviate from the actual value
B . There is an optical amplifier but no filter locally. The full-wave noise of the local optical amplifier affects the OSNR of the wavelength in the pass-through direction.
C . The source and sink optical amplifiers of the optical cross-connect at this site must be in the same network element.

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Answer: A