Use Rational Exponents to Simplify $\sqrt [ 8 ] { x ^ { 6 } }$

Multiple Choice

Use rational exponents to simplify. Assume that all variables represent positive real numbers.
- $\sqrt [ 8 ] { x ^ { 6 } }$

A) $\sqrt [ 4 ] { \mathrm { x } ^ { 3 } }$
B) $\sqrt [ 4 ] { x }$
C) $\sqrt { x ^ { 3 } }$
D) $\sqrt { x }$