To prevent the corrosion of the anode in the Hall-Heroult process,which of the following action is done?

  • A
    Coke powder is added to mix with electrolyte
  • B
    Co-electrolytes like fluorspar is used
  • C
    Coke powder is sprayed at the top of electrolyte melt
  • D
    Anode is replaced by $Pt$ electrode instead of graphite electrode

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