Evaluate If Possible $( 16 ) ^ { - 5 / 4 }$

Multiple Choice

Evaluate if possible. If the expression is not a real number, so state.
- $( 16 ) ^ { - 5 / 4 }$

A) 32
B) $- \frac { 1 } { 32 }$
C) -32
D) $\frac { 1 } { 32 }$