$$\alpha $$ and $$\beta $$ 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. $$\frac{{{\text{h}}\tan \alpha }}{{\text{S}}}$$

B. $$\frac{{{\text{h}}\tan \beta }}{{\text{S}}}$$

C. $$\frac{{{\text{h}}\left( {\tan \alpha + \tan \beta } \right)}}{{\text{S}}}$$

D. $$\frac{{{\text{h}}\left( {\tan \alpha - \tan \beta } \right)}}{{\text{S}}}$$

Answer: Option C