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Match Group A with Group B:

$\begin{array}{|l|l|} \hline \textbf{Group A} & \textbf{Group B} \\ \hline \text{P: Biot number} & \text{1: Ratio of buoyancy to viscous force} \\ \hline \text{Q: Grashof number} & \text{2: Ratio of inertia force to viscous force} \\ \hline  \text{R: Prandtl number} & \text{3: Ratio of momentum to thermal diffusivities} \\ \hline  \text{S: Reynolds number} & \text{4: Ratio of internal thermal resistance to } \\ {} & \text{       boundary layer thermal resistance}\\ \hline  \end{array}$

  1. $P-4, Q-1, R-3, S-2$
  2. $P-4, Q-3, R-1, S-2$
  3. $P-3, Q-2, R-1, S-4$
  4. $P-2, Q-1, R-3, S-4$
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