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Cryolite is:...

Cryolite is:

A

`Na_3AlF_6` and is used in the electrolysis of alumina for decreasing electrical conductivity

B

`Na_3AlF_6` and is used in the electrolysis of alumina for lowering the melting point of alumina only

C

`Na_3AlF_6`and is used in the electrolysis of alumina for lowering the melting point and increasing the conductivity of alumina

D

`Na_3AlF_6` and is used in the electrolytic refining of alumina

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