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: Radiology
The method to diagnose displaced intrauterine device is: 
Select and explain. 
A. Ultrasound, B. X-ray abdomen (erect view), C. Uterine sound and hysteroscopy, D. All of the above
D: All of the above
Answer: D: All of the above 
Explanation: Ans. All of the above