Simplify the Expression $$( \sqrt [ 6 ] { 3 x y } ) ^ { 6 }$$

Multiple Choice

Simplify the expression. Assume all variables represent positive real numbers. $$( \sqrt [ 6 ] { 3 x y } ) ^ { 6 }$$

A) $\sqrt { 3 x y }$
B) $3 x y$
C) $\sqrt [ 6 ] { 3 } x y$
D) $3 \sqrt [ 6 ] { x y }$