Match items of Column-$I$ with the items of Column-$II$ and assign the correct code :

Column $I$	Column $II$
$A$. Cyanide process	$i$. Ultrapure $Ge$
$B$. Froth floatation	$ii$. Dressing of $ZnS$
$C$. Electrolytic reduction	$iii$. Extraction of $Al$
$D$. Zone refining	$iv$. Extraction of $Au$
	$v$. Purification of $Ni$

• A
  $A-i, B-ii, C-iii, D-iv$
• B
  $A-iii, B-iv, C-v, D-i$
• C
  $A-iv, B-ii, C-iii, D-i$
• D
  $A-ii, B-iii, C-i, D-v$