Write in Radical Form $\mathrm { x } ^ { 1 / 7 }$

Multiple Choice

Write in radical form. Assume all variables represent positive real numbers.
- $\mathrm { x } ^ { 1 / 7 }$

A) $\frac { 1 } { \sqrt [ 7 ] { x } }$
B) $x ^ { - 7 }$
C) $\sqrt { x ^ { 7 } }$
D) $\sqrt [ 7 ] { x }$