Find the Area of the Specified Region $r ^ { 2 } = 5 \cos 3 \theta$

Multiple Choice

Find the area of the specified region.
-Inside the six-leaved rose $r ^ { 2 } = 5 \cos 3 \theta$

A) $\frac { 5 } { 2 }$
B) 10
C) 5
D) $\frac { 5 } { 3 }$