What of these does not accurately describe the wright brothers first airplane?

The Wright brothers' first airplane, the Wright Flyer, was not a powered, heavier-than-air craft; it was indeed a powered, heavier-than-air airplane. It was also not the first aircraft to achieve sustained flight, as the Wright Flyer successfully made its first powered flight on December 17, 1903. Additionally, it did not have a closed cockpit, as it was an open-frame design.