Find the Root $$\sqrt [ 3 ] { x ^ { 42 } }$$

Multiple Choice

Find the root. Assume that all variables represent nonnegative real numbers.
- $$\sqrt [ 3 ] { x ^ { 42 } }$$

A) $x ^ { 14 }$
B) $\sqrt [ 3 ] { \mathrm { x } ^ { 42 } }$
C) $x ^ { 39 }$
D) $x ^ { 21 }$