Simplify the Expression and Write the Answer Without Negative Exponents $\left( 9 x ^ { - 2 } \right) \left( 8 x ^ { - 6 } \right)$

Multiple Choice

Simplify the expression and write the answer without negative exponents.
- $\left( 9 x ^ { - 2 } \right) \left( 8 x ^ { - 6 } \right)$

A) $- 72 x ^ { 12 }$
B) $72 x ^ { 12 }$
C) $\frac { 72 } { x ^ { 8 } }$
D) $72 x ^ { 8 }$