The angles of elevation of the top of a tower and the top of a flagstaff on it are observed to be $$30^\circ$$ and $$60^\circ$$ respectively from a point P on the level ground 200 meters away from the foot of the tower. Then the length of the flagstaff (in meters) is

A

$$200\sqrt{3}$$

B

$$\frac{200}{\sqrt{3}}$$

C

$$400\sqrt{3}$$

D

$$\frac{400}{\sqrt{3}}$$