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With respect to fluid flow, match the following in Column $X$ with Column $Y$:

$$\begin{array}{|l|l|} \hline \qquad \textbf{Column X} &  \qquad \textbf{Column Y} \\ \hline \text{(P) Viscosity} &  \text{(I) Mach number} \\ \hline \text{(Q) Gravity} &  \text{(II) Reynolds number} \\ \hline \text{(R) Compressibility} &  \text{(III) Euler number } \\ \hline \text{(S) Pressure } &  \text{(IV) Froude number} \\ \hline \end{array}$$

Which one of the following combinations is correct?

  1. $\text{(P) –  (II), (Q) – (IV), (R) – (I), (S) – (III)}$
  2. $\text{(P) - (III), (Q) – (IV), (R) – (I), (S) – (II)}$
  3. $\text{(P) - (IV), (Q) – (II), (R) – (I), (S) – (III)}$
  4. $\text{(P) - (II), (Q) – (IV), (R) – (III), (S) – (I)}$
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