Simplify the Expression $$\left( 3 m ^ { 2 } n ^ { - 3 } \right) ^ { 2 }$$

Multiple Choice

Simplify the expression. Write the result without using negative exponents. (Assume all variables represent nonzero
real numbers.)
- $$\left( 3 m ^ { 2 } n ^ { - 3 } \right) ^ { 2 }$$

A) $3 m ^ { 4 } n ^ { 6 }$
B) $\frac { 3 m ^ { 4 } } { n ^ { 6 } }$
C) $9 m ^ { 4 } n ^6$
D) $\frac { 9 m ^ { 4 } } { n ^ { 6 } }$