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.
- $\sin \frac { \theta } { 2 } \cos \frac { \theta } { 2 } = ?$

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