For A $\neq$ 0, the Polar Curve $r ^ { 2 } = a \cos 2 \theta$

Multiple Choice

For a $\neq$ 0, the polar curve $r ^ { 2 } = a \cos 2 \theta$ is a

A) Circle
B) Two-petal rose
C) Four-petal rose
D) Limaçon
E) Lemniscate