Which of the following descriptions of the error correction coding of eLTE-IoT is wrong?

Which of the following descriptions of the error correction coding of eLTE-IoT is wrong?
A . Error correction coding technology is to perform error correction and correction after the entire data packet is transmitted.
B . Error correction coding is FEC forward error correction coding.
C . If the error correction scenario exceeds the FEC error correction range, ARQ and HARQ mechanisms will be used for retransmission.
D . The role of HARQ is to achieve a balance between time delay and packet loss rate, and this work cannot be completed by error correction coding.

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Answer: A