The correct answer to the Full Up Prep Liberty quiz is the skill in the video is first Legal in Level 3. The male base maintains contact with the top’s right foot during the entire transition, making the stunt a full up to prep level. Level 3 allows unreleased full ups to prep level, regardless of the stunt ending on 1 or 2 feet/legs. A released full up to prep level would first be allowed in Level 4.
The explanation is based on the 2017-18 version of the cheer rules dated August 30, 2017.