In the following table, identify the correct set of associations between the entries in Column-$1$ and Column-$2.$
$$\begin{array}{|l|l|}
\hline {\qquad \text{Column-1} } & {\qquad \qquad \quad \text{Column-2} } \\
\hline \text{P: Reverse Osmosis} & \text{I: Ponding} \\
\hline \text{Q: Trickling Filter} & \text{II: Freundlich Isotherm} \\
\hline \text{R: Coagulation} & \text{III: Concentration Polarization} \\
\hline \text{S: Adsorption} & \text{IV: Charge Neutralization} \\
\hline
\end{array}$$
- $\text{P-II, Q-I, S-III}$
- $\text{Q-III, R-II, S-IV}$
- $\text{P-IV, R-I, S-II}$
- $\text{P-III, Q-I, R-IV}$