Match correct answer using the codes given below :

Question

Column I	Column II
I. Cyanide process	A. Ultrapure Ge
II. Flotation process	B. Pine oil
III. Electrolytic reduction	C. Extraction of Al
IV. Zone refining	D. Extraction of Au

$(a)\; I-C, II-A, III-D, IV-B \\ (b)\; I-D, II-B, III-C, IV-A \\(c)\;I-C, II-B, III-D, IV-A \\ (d)\;I-D, II-A, III-C, IV-B$