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A tube is bent into $L$ shape and kept in a vertical plane. If these three liquids are kept in equilibrium by the piston of area $A$ , the value of $\frac {F}{A}$ is
  • A$({\rho _1}{h_1} + {\rho _2}{h_2} + {\rho _3}{h_3})g$
  • B$({\rho _1}{h_1} + {\rho _2}{l_2} + {\rho _3}{h_3})g$
  • C$({\rho _2}{h_2} + {\rho _3}{h_3})g$
  • D$({\rho _2}{l_2} + {\rho _3}{h_3})g$
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