A minute hand of a clock is 20cm long.How far does the tip of the hand move in 20 minutes.

Question

$(a)\;\large\frac{20\pi}{3}$$\qquad(b)\;\large\frac{10\pi}{3}$$\qquad(c)\;\large\frac{40\pi}{3}$$\qquad(d)\;None\;of\;these$