Raise to the Power or Find the Root $\left( \frac { 1 } { 16 } \right) ^ { - 1 / 4 }$

Multiple Choice

Raise to the power or find the root. Assume that all variables represent positive numbers. Write with only positive
exponents.
- $\left( \frac { 1 } { 16 } \right) ^ { - 1 / 4 }$

A) $- 2$
B) $\frac { 1 } { 2 }$
C) 2
D) $\frac { - 1 } { 2 }$