Which among the following statement(s) is(are) true for the extraction of aluminium from bauxite?
(A) Hydrated Al2O3 precipitates, when CO2 is bubbled through a solution of sodium aluminate.
(B) Addition of Na3AlF6 lowers the melting point of alumina.
(C) CO2 is evolved at the anode during electrolysis.
(D) The cathode is a steel vessel with a lining of carbon