Identify the correct statement with reference to the extractive metallurgy of aluminium ?

A. The electrolyte consists of molten Na3AlF6 with approximately 1 to 8% Al2O3

B. Anode effect sets in when the cryolite concentration goes below 40%.

C. Sodium is deposited along with aluminium, but is immediately vaporised

D. Approximately 80% of the aluminium deposited on the cathode comes from cryolite

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