Final answer:
A garden light is typically an actuator, as it converts electrical power into light. It is neither a sensor nor a controller and does not match the other references provided.
Step-by-step explanation:
A garden light can be considered an actuator, which is a type of device that takes low-power electronic signals and converts them into some form of physical action. In the case of a garden light, it would typically be an LED or bulb that receives electrical power and produces light as the physical action, possibly in response to a control signal, such as a timer or a light sensor. This is distinct from a sensor, which detects some form of input from the physical environment and sends it to a controller, and a controller, which processes sensor inputs and provides outputs to actuators.
Therefore, based on the given information and typical functionality of a garden light, option B. Actuator is the correct choice. This answer aligns with none of the provided information references (a. turning on a light switch, b. solar panels at work, c. formation of static electricity, d. none of the above), as they do not directly relate to the function of a garden light as an actuator.
In the case of a garden light, the actuator is responsible for turning on and off the light. When a sensor detects a certain condition, such as darkness, it sends a signal to the actuator, which then activates the light.