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
Derive the magnification from the following illustration: 
Select and explain. 
A. a/b, B. X/Y, C. a/(a-b), D. Both 1 and 2
D: Both 1 and 2
Answer: D: Both 1 and 2 
Explanation: Magnification
All conventional radiographic images are magnified. Radiographs are “shadow pictures” and the size of the shadow depends upon the relative relationship of X-ray source, object and image receptor.