The correct answer is C. control.
Control is the heart of automation technology. It is the process of monitoring and adjusting a system to achieve a desired outcome. Control systems are used in a wide variety of applications, from industrial processes to home appliances.
Robots are machines that are capable of carrying out a series of actions automatically. They are often used in manufacturing and assembly lines. Computers are electronic devices that are capable of storing and processing information. They are used in a wide variety of applications, from word processing to scientific research. Sensors are devices that detect and measure physical quantities, such as temperature, pressure, and light. They are used in a wide variety of applications, from industrial processes to medical devices.
None of the above options are the heart of automation technology. Robots, computers, and sensors are all important components of automation systems, but they are not the heart of the system. The heart of the system is the control system, which is responsible for monitoring and adjusting the system to achieve a desired outcome.