The electrochemical extraction of aluminum from bauxite ore involves

Options

A. the reaction of` Al_2 O_3` with coke (C) at a temperature `gt` `2500^@ `C
B. the neutralization of aluminate solution by passing `CO_2` gas to precipitate hydrated alumina `(Al_2 O_3·3H_2O)`.
C. the dissolution of `Al_2 O_3` in hot aqueous NaOH.
D. the electrolysis of `Al_2 O_3` mixed with `Na_3 AlF_6` to give Al and `CO_2`