A hydraulic fluid flow control circuit, controlling linear actuator speed during extension, with the pump operating at system pressure, is known as a __________.

Correct Answer: Option D — metered-in circuit

A metered-in circuit controls the flow rate of hydraulic fluid entering the actuator. By placing a flow control valve between the pump and the actuator, the speed of the extension stroke is regulated. This is distinct from metered-out circuits, which control the exhaust flow from the actuator.