In IoT architecture, which function best describes the controller?

• A. Sensing data
• B. Providing power supply
• C. Processing data and issuing commands to actuators
• D. Storing data

Answer: (C)

Think of the controller as the brain in an IoT setup. It takes input from sensors, runs the decision-making logic, and then sends commands to actuators to act on the environment. Sensing data is the job of the sensors themselves, not the controller. Providing power is a hardware function separate from the control logic. Storing data is typically handled by storage systems or the cloud, while the controller may momentarily buffer data but doesn’t serve as the primary data store. So the best description of the controller’s function is processing data and issuing commands to actuators, because that’s where sensing leads to informed actions.