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

If a ROADM site adopts WSS+RMU configuration, which of the following impact on SOM is wrong?
A . If the RMU is used locally to add waves and has an optical amplifier, the OSNR value of the wavelength detected by the SOM in the pass-through direction will deviate from the actual value
B. There is an optical amplifier locally but no filter. 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 crossover at this site must be in the same network element

View Answer

Answer: A