Write the Expression with Only Positive Exponents and Evaluate If $- x ^ { - 4 }$

Multiple Choice

Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real
numbers.
- $- x ^ { - 4 }$

A) $\frac { 1 } { x ^ { 4 } }$

B) $4 x$

C) $- 4 x$

D) $- \frac { 1 } { x ^ { 4 } }$