Rewrite the Radical Expression Using Rational Exponents $\left(\sqrt[9]{5 x^{4} y}\right)^{7}$ A) $\left(5 x^{4} y\right)^{7 / 9}$

Multiple Choice

Rewrite the radical expression using rational exponents. A ssume all variables represent nonnegative real numbers.
- $\left(\sqrt[9]{5 x^{4} y}\right) ^{7}$

A) $\left(5 x^{4} y\right) ^{7 / 9}$
B) $(5 x y) ^{19}$
C) $\left(5 x^{4} y\right) ^{9 / 7}$
D) $\left(5 x^{4} y\right) ^{2}$