A hydraulic lift consists of two cylindrical pistons connected by a tube and filled with an incompressible fluid of negligible mass. Piston 1 has a radius \(r\) and Piston 2 has a radius \(2r\). The pistons are at the same horizontal level, and an object of mass \(M\) is placed on top of Piston 2. Which of the following expressions represents the minimum downward force \(F\) that must be applied to Piston 1 to maintain the system in equilibrium?