Find the Least Common Denominator $\frac { 5 } { x ^ { 2 } - 81 } + \frac { 4 } { x ( x - 9 ) }$

Multiple Choice

Find the least common denominator.
- $\frac { 5 } { x ^ { 2 } - 81 } + \frac { 4 } { x ( x - 9 ) }$

A) x(x + 9)
B) x(x - 9)
C) $\left( x ^ { 2 } + 9 \right) \left( x ^ { 2 } - 9 \right)$
D) x(x + 9) (x - 9)