Complete the Identity $\cot \frac { \theta } { 2 } = ?$

Multiple Choice

Complete the identity.
- $\cot \frac { \theta } { 2 } = ?$

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