A conical pendulum of length $$l$$ makes an angle $$\theta = 45^\circ$$ with respect to Z-axis and moves in a circle in the XY plane. The radius of the circle is 0.4 m and its center is vertically below O. The speed of the pendulum, in its circular path, will be - (Take $$g = 10$$ m s$$^{-2}$$)

A

0.2 m s$$^{-1}$$

B

0.4 m s$$^{-1}$$

C

2 m s$$^{-1}$$

D

4 m s$$^{-1}$$