Evaluate If Possible $27 ^ { - 1 / 3 }$

Multiple Choice

Evaluate if possible. If the expression is not a real number, so state.
- $27 ^ { - 1 / 3 }$

A) -3
B) $\frac { 1 } { 3 }$
C) $\frac { 1 } { 27 }$
D) $- \frac { 1 } { 3 }$