Three liquids of densities ${\rho }_1,{\rho }_2\text{ and }{\rho }_3$ and heights as shown are in equilibrium in a U-tube. Match the columns.

Column-I	Column-II
(P) ${\rho }_3=2\left({\rho }_2-{\rho }_1\right)$	(1) $\mathrm{K}=2\mathrm{h}$
(Q) ${\rho }_3=\frac{\left({\rho }_2-{\rho }_1\right)}{2}$	(2) $\mathrm{K}=\mathrm{h}/2$
(R) ${\rho }_1={\rho }_2$	(3) $\mathrm{K}=0$
(S) ${\rho }_2=\frac{3{\rho }_1+{\rho }_3}{3}$	(4)   None of the above

• A

  P Q R S

  3 4 2 1

• B

  P Q R S

  1 2 3 4

• C

  P Q R S

  2 1 3 4

• D

  P Q R S

  4 3 2 1