A tube of uniform diameter D is immersed in a steady flowing inviscid liquid stream of velocity V, as shown in the figure. Gravitational acceleration is represented by 𝑔. The volume flow rate through the tube is ______.

Options :

1. $\frac{\pi }{4}{D}^{2}V$

2. $\frac{\pi }{4}{D}^2\sqrt{2g{h}_2}$

3. $\frac{\pi }{4}{D}^2\sqrt{2g(h_1+h_2)}$

4. $\frac{\pi }{4}{D}^2\sqrt{V^2-2g{h}_2}$