A rational function $f(x)$ and its first derivative are given below:

$f(x)=\frac{8}{x^2-100},f^{\text{'}}(x)=\frac{-16x}{(x-10{)}^2(x+10{)}^2}$

Find the intervals over which the function $f(x)$ is decreasing.

$(0,10)$ and $(10,)$

$(-,-10)$ and $(10,)$

$(-,0)$

$(-10,10)$

$(-,-10)$ and $(-10,0)$

None of the above.