Write with Positive Exponents $x ^ { - 4 / 9 }$

Multiple Choice

Write with positive exponents. Simplify if possible.
- $x ^ { - 4 / 9 }$

A) $\frac { 1 } { x ^ { 4 / 9 } }$
B) $\frac { - 1 } { x ^ { 4 / 9 } }$
C) $- x ^ { 4 / 9 }$
D) $\frac { 1 } { x ^ { 9 / 4 } }$