Read the following text and answer the following questions on the basis of the same :

Two men on either sider of a temple of 30 metres high observe its top at the angles of elevation `alpha` and `beta` respectively, (as shown in the figure above).
The distance between the tow men is `40sqrt3` metres and the distance between the first person A and the temple is `30sqrt3` meters.
`angleCAB=alpha=`

Options

A. `cos^(-1)((1)/(5))`
B. `cos^(-1)((2)/(5))`
C. `cos^(-1)((sqrt3)/(2))`
D. `cos^(-1)((4)/(5))`

Answer

C