In the equation: $M + 8CN^{-} + 2H_2O + O_2 \rightarrow 4[M(CN)_2]^- + 4OH^{-}$,metal $M$ is

Match List-$I$ with List-$II$:

List-$I$ (Property)	List-$II$ (Element/compound)
$I$. Explosive	$A$. $Cu$
$II$. Self-reduction	$B$. $Fe_3O_4$
$III$. Magnetic material	$C$. $Cu(CH_3COO)_2 \cdot Cu(OH)_2$
$IV$. Verdigris	$D$. $Pb(NO_3)_2$

Match List-$I$ and List-$II$ and select the correct answer using the codes given below the lists :

List-$I$	List-$II$
$I.$ Cyanide process	$(1)$ Ultrapure $Ge$
$II.$ Floatation process	$(2)$ Dressing of $HgS$
$III.$ Electrolytic reduction	$(3)$ Extraction of $Al$
$IV.$ Zone refining	$(4)$ Extraction of $Au$

Which of the following is $NOT$ used for the extraction of $Al$?

Extraction of copper from copper pyrite $CuFeS_2$ involves:
$A$. Crushing followed by concentration of the ore by froth-flotation
$B$. Removal of iron as slag
$C$. Self-reduction step to produce 'blister copper' following evolution of $SO_2$
$D$. Refining of 'blister copper' by carbon reduction

Given below are two statements.
Statement $I$: Pig iron is obtained by heating cast iron with scrap iron.
Statement $II$: Pig iron has a relatively lower carbon content than that of cast iron.
In the light of the above statements,choose the correct answer from the options given below.