Simplify the Expression $256 ^ { \frac { 1 } { 4 } }$

Simplify the expression. $256 ^ { \frac { 1 } { 4 } }$

A) $\frac { 1 } { 4 }$
B) $250$
C) $\frac { 1 } { 260 }$
D) $1$
E) $4$