Find the Area of the Specified Region $r = 8 \cos 3 \theta$

Multiple Choice

Find the area of the specified region.
-Inside the three-leaved rose $r = 8 \cos 3 \theta$

A) $32 \pi$
B) $\frac { 16 } { 3 } \pi$
C) $8 \pi$
D) $16 \pi$