In the context of the Hall-Heroult process for the extraction of $Al$,which of the following statements is false?

  • A
    $Al^{3+}$ is reduced at the cathode to form $Al$
  • B
    $Na_3AlF_6$ serves as the electrolyte
  • C
    $CO$ and $CO_2$ are produced in this process
  • D
    $Al_2O_3$ is mixed with $CaF_2$ which lowers the melting point of the mixture and brings conductivity

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