Which polymer is used for making magnetic recording tapes?

Given below are two statements:
Statement $I:$ Ethene at $333$ to $343 \ K$ and $6-7 \ atm$ pressure in the presence of $AlEt_3$ and $TiCl_4$ undergoes addition polymerization to give $LDP$.
Statement $II:$ Caprolactam at $533-543 \ K$ in $H_2O$ through step growth polymerizes to give Nylon-$6$.
In the light of the above Statements,choose the correct answer from the options given below:

Match the polymers given in Column-$I$ with the type of linkage present in them given in Column-$II$.

Column-$I$	Column-$II$
$A$. Terylene	$i$. Glycosidic linkage
$B$. Nylon	$ii$. Ester linkage
$C$. Cellulose	$iii$. Phosphodiester linkage
$D$. Protein	$iv$. Amide linkage
$E$. $RNA$

In polymer Buna-$S$,'$S$' stands for :-

Buna-$S$ is a polymer of

Which of the following is a cross-linked, thermosetting polymer?