單項選擇題

In optical channel transport unit overhead (OTU OH), what are general communication channels 1 and 2(GCC1/GCC2) used for?()

A.for trail trace identification
B.as the backward defect indicator
C.to transmit information between OTU termination points
D.to extend command and management functions over several frames
E.General communication channels 1 and 2 (GCC1/GCC2) do not belong to OTU OH

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