Consider the following metallurgical process:
(A) Heating the sulphide ore in blast furnace so that a part of it is converted to oxideand then on further heating in the absence of air, it undergoes reduction to get the metal.
(B) Electrolysing the molten electrolyte with CaCl2 and the metal is got by electrolytic reduction.
(C) The sulphide ore is mixed with aqueous NaCN in presence of air, the aqueous metal complex formed is precipitated by adding zinc powder.
The process used for obtaining sodium, silver and copper respectively are
(1) A, B and C
(2) B, C and A
(3) C, B and A
(4) B, A and C
