Which of the following is NOT a basic transition used to initiate and/or level off from a climb or descent?

The transition known as "Climb-to-descent" is not typically recognized as a basic transition for initiating or leveling off from a climb or descent. Instead, the standard terminology used in flight training includes transitions that relate specifically to climbing, descending, or achieving a level flight state.

In aviation, transitioning from a climb generally involves leveling off at a designated altitude or changing to a descent, which can be expressed as "Climb-to-cruise" or "Descent-to-level flight.” The option that terms the transition as "Climb-to-descent" suggests a direct movement from one vertical flight profile to another, which is less common in basic training terminology.

Overall, it is crucial to use defined transition labels that emphasize the pilot's intent to maintain a certain flight profile, which makes the other options more applicable in standard flight instruction.