If r and s are positive real numbers, which expression is equivalent to StartFraction r Superscript StartFraction 2 over 3 EndFraction Baseline s Superscript StartFraction 1 over 2 EndFraction Baseline over r s EndFraction?

StartFraction r Superscript StartFraction 2 over 3 EndFraction Baseline over s Superscript StartFraction 1 over 2 EndFraction Baseline