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
Commercially available digital imaging includes: 
Select and explain. 
A. RVG, B. Flash dent, C. Sense-a–ray, D. All of the above.
D: All of the above.
Answer: D: All of the above. 
Explanation: Digital imaging (commercially available): 
• RVG 
• Flash dent 
• Sense-a–ray