Write the Product as a Sum or Difference of Trigonometric $\sin 8 x \cos 8 x$

Multiple Choice

Write the product as a sum or difference of trigonometric functions.
- $\sin 8 x \cos 8 x$

A) $\cos 8 x$
B) $\frac { 1 } { 2 } \sin 16 x$
C) $\cos 4 x$
D) $2 \sin 4 x$