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
True about SAF 
Select and explain. 
A. Are self adjusting files, B. Confirms to 3D root canal anatomy, C. Classified in group 4 of ISO classification, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None