This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
Facial occlusal line in the maxillary arch is formed by 
Select and explain. 
A. Stamp cusps, B. Centric holding cusps, C. Supporting cusps, D. Non-supporting cusps
D: Non-supporting cusps
Answer: D: Non-supporting cusps 
Explanation: None