Hydraulic fluid exerts pressure on the __________.

The correct answer focuses on the component within a hydraulic system where hydraulic fluid plays a critical role. Hydraulic fluid is designed to transmit force through a system, and it does so by exerting pressure on various components.

The hydraulic piston is effectively a movable part within the cylinder, where the liquid pushes against it to create movement or mechanical work. Specifically, the hydraulic fluid fills the cylinder, and when pressure is applied, it exerts force on the piston, causing it to move. This is fundamental to how hydraulic systems work, allowing for the amplification of force, which is why understanding the roles of each component is crucial.

The operator does not receive pressure from the hydraulic fluid itself; instead, they work the controls of the system. The term conductor in this context does not accurately represent any conventional hydraulic components but could be mistakenly considered in different contexts. Lastly, while the cylinder is a correct context for where the fluid acts, the specific component that translates that pressure into movement is the piston.