The suit, which seeks unspecified monetary damages, also alleges that the helicopter was designed and built by Airbus Helicopters, a unit of Airbus, with flaws to its tail rotor system which malfunctioned and made the aircraft "uncontrollable in the event of a failure, especially at low speeds, hover and/or liftoff."
Utilize the input text as a context reference, choose the right relationship between 'Airbus' and 'aircraft' from the options.
Options: developer, chief executive officer, product/material produced, owned by