Solve the Equation and Express the Solution in Exact Form $$\log _ { 4 } ( x + 4 ) + \log _ { 4 } ( x - 4 ) = 3$$

Multiple Choice

Solve the equation and express the solution in exact form.
- $$\log _ { 4 } ( x + 4 ) + \log _ { 4 } ( x - 4 ) = 3$$

A) $\{ 80 \}$
B) $\left\{ \frac { 67 } { 4 } \right\}$
C) $\{ 4 \sqrt { 5 } \}$
D) $\left\{ \frac { 64 } { 3 } \right\}$