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
Advantages of combination clasp: 
Select and explain. 
A. It is flexible, B. It can be adjusted, C. It is more esthetic as compared to cast circumferential clasp, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None