(D) The correct option is $(D)$.The Orford process is primarily used for the separation of $Ni$ and $Cu$ from their sulfide ores.During the electrolyt

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(D) The correct option is $(D)$.The Orford process is primarily used for the separation of $Ni$ and $Cu$ from their sulfide ores.During the electrolytic refining of $Ni$ obtained from Orford bottoms,precious metals like $Pt$,$Au$,and $Ag$ collect as anode mud in a concentrated form,which is later processed to recover these metals.