The angle of elevation of the top of a 36 m tall tower from the initial position of a person on the ground was `60^@`. She walked away in a manner that the foot of the tower, her initial position and the final position were all in the same straight line. The angle of elevation of the top of the tower from her final position was `30^@`. How much did she walk from her initial position?

Options

A. 24m
B. `24 sqrt3 m`
C. `12 sqrt3 m`
D. `36 sqrt3 m`