Match the variable in Group-$1$ with the instruments in Group-$2$.
$\begin{array}{cc}\
&\text{Group-$1$} & \text{Group-$2$} \\
&\text{P. Temperature} & \text{ I. Capacitance probe} \\
&\text{Q. Liquid level} & \text{II. McLeod gauge} \\
&\text{R. Vacuum} & \text{III. Chromatograph } \\
&\text{S. Concentration} & \text{IV. Thermistor} \\ \end{array}$
Choose the correct set of combinations.
- $P-IV,\:Q-III,\:R-II,\:S-I$
- $P-I,\:Q-II,\:R-IV,\:S-III$
- $P-IV,\:Q-I,\:R-II,\:S-III$
- $P-III,\:Q-II,\:R-I,\:S-IV$