In the WDM model, the payload part of the OMS layer of the functional unit that completes the OEO conversion is processed on the MUX/DEMUX/OADM board OTU optical wavelength conversion board

In the WDM model, the payload part of the OMS layer of the functional unit that completes the OEO conversion is processed on the MUX/DEMUX/OADM board OTU optical wavelength conversion board
A . OLA
B . MUX
C . DEMUX
D . OTU

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Answer: D