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
PROTAPER NEXT is 
Select and explain. 
A. Based on M wire NiTi Phase, B. Has reamer with alternative cutting edges, C. Has alternating wall contact points, D. Based on R phase NiTi
A: Based on M wire NiTi Phase
Answer: A: Based on M wire NiTi Phase 
Explanation: Option B is for RACE
Option C is for Endo sequence/ Real world endo
Twisted file, K3XF etc uses R phase Ni Ti