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
A double bar anterio posterior palatal major connector is indicated when 
Select and explain. 
A. A single palatal bar is not rigid, B. Maximum palatal support is needed, C. High vault palate is present, D. All of the above
A: A single palatal bar is not rigid
Answer: A: A single palatal bar is not rigid 
Explanation: None