Graph of the Following Curve Is Given $$r = 6 \cos ^ { 2 } \left( \frac { \theta } { 2 } \right)$$

Multiple Choice

Graph of the following curve is given. Find its length. Select the correct answer.
$$r = 6 \cos ^ { 2 } \left( \frac { \theta } { 2 } \right)$$

A) $L = 25$
B) $L = 24$
C) $L = 26$
D) $L = 32$
E) $L = 20$