Find the derivative of the function.

$f(s)=\frac{\sqrt[\phantom{2}]{s}-6}{\sqrt[\phantom{2}]{s}6}$

Choose the correct answer below.

A$.\frac{6}{\sqrt[\phantom{2}]{s}(\sqrt[\phantom{2}]{s}-6{)}^2}$

c$.\frac{6}{(\sqrt[\phantom{2}]{s}-6{)}^2}$