Consider the following metallurgical processes :
(1) Heating impure metal with `CO` and distilling the resulting volatile carbonyl `(BP 43^@ C)` and finally decomposing at `150^@C` to `230^@ C` to get pure metal.
(2) Heating the sulphide ore in air until a part is converted to oxide and then further heating in the absence of air to let the oxide react with unchanged sulphide.
(3) Electrolysing the molten electrolyte containing `CaCl_(2)` to obtain the metal
The processes used for obtaining sodium, nickel, and copper are, respectively

Options

A. 1,2 and 3
B. 2,3 and 1
C. 3,1 and 2
D. 2,1 and 3

Answer

C