Which of the following key technologies is used to improve data transmission reliability and reduce retransmission caused by data transmission errors, Thereby indirectly improving spectral efficiency? _SC

Which of the following key technologies is used to improve data transmission reliability and reduce retransmission caused by data transmission errors, Thereby indirectly improving spectral efficiency? _SC
A . F-OFDMA //
B . High-order modulation
C . Channel codding
D . Massive MIMO

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Answer: C