Rewrite the Expression Without Using Negative Exponents $\frac { a ^ { 2 } } { b ^ { - 4 } }$

Multiple Choice

Rewrite the expression without using negative exponents. (Assume all variables represent nonzero real numbers.)
- $\frac { a ^ { 2 } } { b ^ { - 4 } }$

A) $a ^ { 2 } b ^ { 4 }$
B) $\frac { b ^ { 4 } } { a ^ { 2 } }$
C) 1
D) $\left( \frac { a } { b } \right) ^ { - 2 }$