If $y(x)=-9e^{x^{-9}},$ find $y^{\text{'}}(x)$

Select the correct answer below:

$y^{\text{'}}(x)=81x^{-9}{e}^{x^{-9}}$

$y^{\text{'}}(x)=81e^{x^{-10}}$

$y^{\text{'}}(x)=81x^{-10}{e}^{x^{-2}}$

$y^{\text{'}}(x)=-9e^{x^{-9}}$