Write with Positive Exponents $16 ^ { - 5 / 4 }$

Multiple Choice

Write with positive exponents. Simplify if possible.
- $16 ^ { - 5 / 4 }$

A) $\frac { 1 } { 32 }$
B) not a real number
C) $- \frac { 1 } { 32 }$
D) 32