Provide an Appropriate Response $r = a \csc \theta$ B) $r = a \sin \theta$

Multiple Choice

Provide an appropriate response.
-What form do planes perpendicular to the y-axis have in cylindrical coordinates?

A) $r = a \csc \theta$
B) $r = a \sin \theta$
C) $r = a \cos \theta$
D) $r = a \sec \theta$