Match the item in Column I with the corresponding technique in Column II.
\begin{array}{|c|c|c|}
\hline & \text{Column I} & \text{Column II} \\
\hline & \text{P. Blue laser} & 1. \text{Electron microscopy} \\
\hline & \text{Q. Tungsten filament} & 2. \text{Fluorescence activated cell sorting} \\
\hline & \text{R}. { }^{15} \mathrm{~N labelled protein} & 3. \text{Electrophoresis} \\
\hline & \text{S. Polyacrylamide} & 4. \text{Nuclear magnetic resonance spectroscopy} \\
\hline
\end{array}
- $\text{P-2; Q-3; R-1; S-4}$
- $\text{P-2; Q-1; R-4; S-3}$
- $\text{P-3; Q-1; R-4; S-2}$
- $\text{P-3; Q-1; R-4; S-2}$