Use Radical Notation to Write the Expression $6 x ^ { 1 / 4 }$

Multiple Choice

Use radical notation to write the expression. Simplify if possible.
- $6 x ^ { 1 / 4 }$

A) $\sqrt [ 4 ] { 6 x }$
B) $\frac { 3 } { 2 } x$
C) $6 x$
D) $6 \sqrt [ 4 ] { x }$