Find the Length of the Curve Over the Given Interval $$r = 24 \cos \theta , - \frac { \pi } { 2 } \leq \theta \leq \frac { \pi } { 2 }$$

Multiple Choice

Find the length of the curve over the given interval. $$r = 24 \cos \theta , - \frac { \pi } { 2 } \leq \theta \leq \frac { \pi } { 2 }$$

A) $24 \pi$
B) $12 \pi$
C) $48 \pi$
D) $72 \pi$
E) $6 \pi$