The angle of elevation of the top of a tower froma point P on the groundis $$45^\circ$$ and moving s feet towards the tower the angle of elevation is found to be $$60^\circ$$. The height (in feet) of the tower is

A

$$\sqrt{3} s$$

B

$$(\sqrt{3} - 1)s$$

C

$$(\sqrt{3} + 1)s$$

D

$$\frac{\sqrt{3}}{\sqrt{3} - 1}s$$