Simplify the expression using properties of exponents. Write your answer with positive exponents onl

Simplify the expression using properties of exponents. Write your answer with positive exponents only. Assume that variables are not 0.

fraction numerator 12 r to the power of 9 s to the power of 0 over denominator left parenthesis 2 s right parenthesis to the power of 0 end fraction

A. fraction numerator 6 r to the power of 9 over denominator s end fraction

B. 6r^9

C. 12r^9

D. fraction numerator 12 r to the power of 9 over denominator s end fraction