The correct option is B Embedded computers
An embedded system is a computer system with a dedicated function within a larger mechanical or electrical system, often with a real-time computing mechanism. They are self-contained computer devices that their own programming and typically do not receive input from user nor do they interact with other systems. They can range from portable devices such as digital watches, MP3 players, cars, electronic thermostat, etc., to large stationary installations like traffic lights, factory controllers or the system controlling nuclear power plants.