Find a Polar Equation for the Parabola with Its $$\left( 3 , - \frac { 1 } { 2 } \pi \right)$$

Multiple Choice

Find a polar equation for the parabola with its focus at the pole and vertex $$\left( 3 , - \frac { 1 } { 2 } \pi \right)$$

A) $r = \frac { 6 } { 1 - \cos \theta }$
B) $r = \frac { 6 } { 1 - \sin \theta }$
C) $r = - \frac { 6 } { 1 + \cos \theta }$
D) $r = \frac { 6 } { 1 + \cos \theta }$
E) $r = \frac { 6 } { 1 + \sin \theta }$