Write the Expression with Only Positive Exponents and Evaluate If $- 7 ^ { - 4 }$

Multiple Choice

Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real
numbers.
- $- 7 ^ { - 4 }$

A) 2401
B) $\frac { 1 } { 2401 }$
C) $- 2401$
D) $- \frac { 1 } { 2401 }$