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
The design for a maxillary cast RPD frame work with a double bar (anteriorly and posteriorly) type of major connector is indicated when: 
Select and explain. 
A. Maximum palatal support is required, B. High vault type of palate, C. Acrylic plate for palate is to be used, D. Where a single palatal bar connector would flex
D: Where a single palatal bar connector would flex
Answer: D: Where a single palatal bar connector would flex 
Explanation: None