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What is the correct answer?

4

α and β are the angles subtended by a point of elevation h at their air station with respective plumb points. Photo scale and focal length of the lens being S and f respectively. Parallax displacement of the point due to relief, is

A. h tan α/S

B. h tan β/S

C. h (tan α + tan β)/S

D. h (tan α - tan β)/S