Find the Exact Solution to the Equation $$\log _ { 2 } ( x - 4 ) = - 1$$

Find the exact solution to the equation.
- $$\log _ { 2 } ( x - 4 ) = - 1$$

A) $x = - 3.5$
B) $x = 6$
C) $x = 4.5$
D) $x = - 2$