What are the removable discontinuities of the following function?
$f(x)=\frac{x^2-36}{x^3-36 x}$
A$x=-6, x=0$, and $x=6$
B$x=-6$ and $x=6$
C$x=0$ and $x=-6$
D$x=0$ and $x=6$
$f(x)=\frac{x^2-36}{x^3-36 x}$
A$x=-6, x=0$, and $x=6$
B$x=-6$ and $x=6$
C$x=0$ and $x=-6$
D$x=0$ and $x=6$