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 advantages of using a metal denture base are: 
Select and explain. 
A. Increased rigidity with Less bulk, B. Reduction of bulk in the palate, C. Better stimulation of the underlying tissue, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: None