The relation between the air base (B), photographic base (b), flying height (H) and the focal length (f) of a vertical photograph, is

• A. <img src="/_files/images/civil-engineering/advanced-surveying/89-4.105-1.png">
• B. <img src="/_files/images/civil-engineering/advanced-surveying/89-4.105-2.png">
• C. <img src="/_files/images/civil-engineering/advanced-surveying/89-4.105-3.png">
• D. <img src="/_files/images/civil-engineering/advanced-surveying/89-4.105-4.png">