Rationalize the Denominator and Simplify $\sqrt { \frac { 4 } { 5 } }$

Multiple Choice

Rationalize the denominator and simplify. Assume all variables represent nonnegative real numbers.
- $\sqrt { \frac { 4 } { 5 } }$

A) $\frac { 2 \sqrt { 5 } } { 5 }$
B) $2 \sqrt { 5 }$
C) 27
D) $\frac { 4 \sqrt { 5 } } { 5 }$