Frequency synchronization can be distributed via Synchronous Ethernet. Please select true statement for SynchE.

Frequency synchronization can be distributed via Synchronous Ethernet. Please select true statement for SynchE.
A . SynchE is a layer 2 – link layer
B . The stability of the recovered frequency depends on the network load
C . SynchE must be supported at all intermediate nodes on the synchronization path
D . SynchE is transported in OTN frames

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Answer: D