Find a Polar Equation for the Conic $\mathrm { e } = 1$

Multiple Choice

Find a polar equation for the conic. A focus is at the pole.
- $\mathrm { e } = 1$ ; directrix is parallel to the polar axis 1 above the pole

A) $r = \frac { 3 } { 1 + \cos \theta }$
B) $r = \frac { 3 } { 1 + \sin \theta }$
C) $r = \frac { 3 } { 1 - \cos \theta }$
D) $r = \frac { 3 } { 1 - \sin \theta }$