Evaluate the Expression $$\left( \frac { 4 } { 49 } \right) ^ { 1 / 2 }$$

Multiple Choice

Evaluate the expression.
- $$\left( \frac { 4 } { 49 } \right) ^ { 1 / 2 }$$

A) $\frac { 4 } { 7 }$

B) not a real number

C) $\frac { 2 } { 49 }$

D) $\frac { 2 } { 7 }$