hydrostatic forces on a vertical wall

Question

A tank with four equal vertical faces of width / and depth h is filled up with a liquid. If the force on any vertical side is equal to the force at the bottom, then the value of <!--[if gte msEquation 12]>h/l<![endif]-->  h/l will be

(a) 2                 (b) $\sqrt{2}$                        (c) 1                 (d) 1/2