Simplify the Expression $$\sqrt { \frac { 4 } { 5 } }$$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $$\sqrt { \frac { 4 } { 5 } }$$

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