Use Radical Notation to Write the Expression $\left( \frac { 1 } { 16 } \right) ^ { 1 / 2 }$

Multiple Choice

Use radical notation to write the expression. Simplify if possible.
- $\left( \frac { 1 } { 16 } \right) ^ { 1 / 2 }$

A) $\frac { 1 } { 4 }$
B) $- \frac { 1 } { 4 }$
C) $- 4$
D) 4