Write the Expression with Only Positive Exponents and Evaluate If $- 3 ^ { - 4 }$

Multiple Choice

Write the expression with only positive exponents and evaluate if possible. Assume all variables represent nonzero real
numbers.
- $- 3 ^ { - 4 }$

A) $- 81$
B) $\frac { 1 } { 81 }$
C) $- \frac { 1 } { 81 }$
D) 81