Choose the One Alternative That Best Completes the Statement or Answers

Multiple Choice

Choose the one alternative that best completes the statement or answers the question.
Complete the identity.
- $$\csc ^ { 2 } \frac { \theta } { 2 } = ?$$

A) $\frac { 2 } { 1 - \cos \theta }$
B) $\frac { 1 - \sec \theta } { 2 }$
C) $\frac { 2 } { 1 + \sin \theta }$
D) $\frac { 1 + \sec \theta } { 2 }$