Question Pool -- Category E2D

How is Forward Error Correction implemented?
A.
By transmitting blocks of 3 data characters from the sending station to the receiving station which the receiving station acknowledges
B.
By transmitting a special FEC algorithm which the receiving station uses for data validation
C.
By transmitting each data character twice, since there is no specific acknowledgment of reception
D.
By varying the frequency shift of the transmitted signal according to a predefined algorithm

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