Simplify the Expression $\left(\mathrm{x}^{2 / 3}\right)^{4 / 7}$ A) $x^{8 / 21}$

Multiple Choice

Simplify the expression. Assume all variables represent nonnegative real numbers.
- $\left(\mathrm{x}^{2 / 3}\right) ^{4 / 7}$

A) $x^{8 / 21}$
B) $x^{26 / 21}$
C) $x^{8 / 7}$
D) $x^{21 / 8}$