What is the function of the FEC field within the OTN signal structure?

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What is the function of the FEC field within the OTN signal structure?
A . It allows the sending devices to apply QoS within the OTN forwarding structure.
B . It allows source nodes to discard payload errors before transmitting data on the network.
C . It allows receivers to correct errors upon data arrival.
D . It allows deep inspection of data payload fields.

Answer: C