Solenoid valves are available to control:

A) oil flow.
B) air flow.
C) water flow.
D) all of these

Oil Flow

Refers to the movement or circulation of oil through a system, important for lubrication, cooling, and hydraulic purposes.

Solenoid Valves

Electromechanical valves controlled by electric current to open or close flow in a hydraulic or pneumatic system.

Air Flow

The movement of air from one area to another, often critical in processes for cooling, ventilation, and combustion.