Which of the following statements about OTN reuse and overhead is wrong?

Which of the following statements about OTN reuse and overhead is wrong?
A . Customer signals (such as IP/MPLS, Ethernet, and SDH signals) are mapped to ODUk as ODU payload plus ODU overhead
B . ODUk combined into OTU overhead and FEC rear overhead mapped to standardized optical channel transport unit, i.e. constitutes OTUk
C . OTN light path overhead with a non-layer overhead, 1 independent optical supervisory channel OSC is responsible for transmitting.
D . The overhead of the OTN electrical layer unit is the on-line overhead, which is transmitted with the payload.

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Answer: A