Given that $f(a)=a^4$ and $g(x)=3x5.$ Convider the following compotaios using the chais nale to find the derivative of the composition.

$f(g(x))=(3x5{)}^4$

$f^{\text{'}}(x)=4u$

$f^{\text{'}}(x(x))=4(3x5)$

$g^{\text{'}}(x)=3$

$(fz{)}^{\text{'}}=12(3x5)$

Therefore, $(f{)}^{\text{'}}=12(3k5).$

Which of the gives computations are incorrect?