Match the $\textbf{Polymer}$ with the most suitable $\textbf{Monomer combinations}$ from which it is synthesized.
$\begin{array}{|l|l|l|l|} \hline& \textbf{Polymer} && \textbf{Monomer combinations} \\ \hline P & \text{Polyurethane } & 1 & \text{Maleic acid and propylene glycol } \\
\hline Q & \text{Epoxy } & 2 & \text{Pyromellitic anhydride and } p, p^{\prime} \text{-diamino diphenyl ether} \\ \hline R & \text{Polyimide} & 3 & \text{Epichlorohydrin and bisphenol A} \\ \hline S & \text{Polyester} & 4 & \text{Hexamethylene diisocyanate and tetramethylene glycol } \\ \hline \end{array}$
- $\text{P}-4; \text{Q}-3; \text{R}-2; \text{S}-1$
- $\text{P}-4; \text{Q}-2; \text{R}-3; \text{S}-1$
- $\text{P}-2; \text{Q}-1; \text{R}-4; \text{S}-3$
- $\text{P}-2; \text{Q}-3; \text{R}-1; \text{S}-4$
