Use the Rules of Exponents to Simplify the Expression $\left(5 \mathrm{a}^{1 / 7} \mathrm{~b}^{5 / 7}\right)^{3}$

Multiple Choice

Use the rules of exponents to simplify the expression. Write the answer with positive exponents. Assume that all variables represent positive real numbers.
- $\left(5 \mathrm{a}^{1 / 7} \mathrm{~b}^{5 / 7}\right) ^{3}$

A) $125(a b) ^{15 / 7}$

B) $5 a^{3 / 7} b^{15 / 7}$

C) $15 \mathrm{a}^{3 / 7} \mathrm{~b}^{5 / 7}$

D) $125 a^{3 / 7} b^{15 / 7}$