Use Radical Notation to Write the Expression $\left( \frac { 8 } { 64 } \right) ^ { 2 / 3 }$

Multiple Choice

Use radical notation to write the expression. Simplify if possible.
- $\left( \frac { 8 } { 64 } \right) ^ { 2 / 3 }$

A) $- \frac { 1 } { 4 }$
B) $\frac { 1 } { 2 }$
C) $\frac { 1 } { 6 }$
D) $\frac { 1 } { 4 }$