When an excess of $KI$ is added to a $CuSO_4$ solution and then $Na_2S_2O_3$ is added to the mixture,which of the following statements is incorrect?
- AThe produced $I_2$ undergoes reduction.
- B$CuI_2$ is produced.
- C$Na_2S_2O_3$ undergoes oxidation.
- D$Cu_2I_2$ is produced.
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