What is the full form of MCDU in aviation?

The full form of MCDU in aviation is Multifunction Control Display Unit. This terminology is widely used in the context of flight management systems within commercial aircraft, including the A320. The MCDU serves as a critical interface for pilots to interact with the aircraft's systems, enabling them to input flight data, access navigation information, and manage autopilot functions. Its multifunction capability allows operators to display various types of information, depending on the current phase of the flight and the pilots' needs.

Understanding the role of the MCDU is essential for effective operation of the aircraft, as it consolidates multiple functions into a single unit, streamlining communication between the pilot and the aircraft's systems. The other options suggest alternative meanings that are not standard in aviation terminology, further reinforcing that A is the correct answer.