Which of the following is a listed controller type?

• A. Hybrid Controller
• B. Smart Controller
• C. IoT Controller
• D. Analog Controller

Answer: (A)

Understanding what a "listed controller type" means in irrigation design focuses on formal safety and performance certification. A listed controller type is one that has been evaluated by a recognized testing laboratory and carries a listing mark, signaling it meets specific standards for use with irrigation equipment.

The hybrid controller is the best answer because it represents a controller type that is commonly described in listing and certification contexts. It combines multiple control approaches (often both time-based and sensor-driven features) and is offered as a device that can be certified and listed for safe installation in a variety of systems. This makes it a clearly recognized listed type.

Smart controllers describe capabilities and networking features, not the official listing category. IoT controllers likewise emphasize connectivity rather than the formal listing classification. Analog controllers refer to a control method and era rather than a specific certified listing category.