Hydroelectric plants are designed with a dam. Because of this the answer is this top one.
Reason:
"A hydraulic press works on the principle of Pascal's law, which states that when pressure is applied to a confined fluid, the pressure change occurs throughout the entire fluid. Within the hydraulic press, there is a piston that works as a pump, that provides a modest mechanical force to a small area of the sample."
If I'm wrong correct me, thank you.
