Assuming ideal fluid and the reservoir is large, the velocity at point P in the siphon tube is

Question

A siphon draws water from a reservoir and discharges it out at atmospheric pressure. Assuming ideal fluid and the reservoir is large, the velocity at point P in the siphon tube is             

     (a)$\sqrt{2gh_{1}}$                                                                  (b) $\sqrt{2gh_{2}}$ 

      (c)$\sqrt{2g\left ( _{h_{2}-h_{1}} \right )}$                                                                  (d)$\sqrt{2g\left ( _{h_{2}+h_{1}} \right )}$