Evaluate If Possible $\left( \frac { 27 } { 64 } \right) ^ { - 1 / 3 }$

Multiple Choice

Evaluate if possible. If the expression is not a real number, so state.
- $\left( \frac { 27 } { 64 } \right) ^ { - 1 / 3 }$

A) $- \frac { 4 } { 3 }$
B) $\frac { 3 } { 4 }$
C) $- \frac { 3 } { 4 }$
D) $\frac { 4 } { 3 }$