In the context of the Hall -Hero ult process for the extraction of Al, which of the following statement is false ?

Question

$\begin{array}{1 1} \text{$Co$ and $CO_2$ are produced in this line process} \\ Al_2O_3 \text{ is mixed with CaF2 which lowers the melting point of the mixture and brings conductivity b} \\ Al^{3+} \text{ is reduced at the cathode to from Al} \\ Na_3AlF_6 \text{serves as the electrolyte } \end{array}$