Simplify the Expression $$\sqrt [ 4 ] { \frac { 625 } { 1296 } }$$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers.
- $$\sqrt [ 4 ] { \frac { 625 } { 1296 } }$$

A) $\frac { 625 } { 1296 }$

B) $\frac { 125 } { 216 }$

C) $\frac { 25 } { 36 }$

D) $\frac { 5 } { 6 }$