Find All Values of the Variable for Which the Rational $$\frac { x ^ { 2 } - 6 x - 16 } { x ^ { 2 } - 81 }$$

Multiple Choice

Find all values of the variable for which the rational expression is undefined.
- $$\frac { x ^ { 2 } - 6 x - 16 } { x ^ { 2 } - 81 }$$

A) $- 8,2$
B) $- 8$
C) $- 2,8$
D) $- 9,9$