The correct answer here is 367054 (2 knuckles) — the candidate's response of 3 knuckles was incorrect.

Explanation: Mandibular depression (opening) is a compound movement with a rotation phase (pure hinge rotation of the condyle around the terminal hinge axis) followed by a translation phase (condyle-disc complex sliding down the articular eminence). When plotted, the pathway/velocity or condylar guidance tracing shows two inflection points ("knuckles") — one marking the transition from rest to rotation, and another marking the transition from rotation to translation — and it is these two knuckles that bound and determine the functional range of mandibular depression (the range used in normal function, as opposed to the full border/maximal opening range).

So: