Write with Positive Exponents $27 ^ { - 4 / 3 }$

Multiple Choice

Write with positive exponents. Simplify if possible.
- $27 ^ { - 4 / 3 }$

A) $- \frac { 1 } { 81 }$
B) $\frac { 1 } { 81 }$
C) 81
D) not a real number