Determine the critical points of the function $f\left(x\right)=\frac{x}{x^2+4}$.

$(-4,\frac{1}{5})$ and $(4,-\frac{1}{5})$

$(-4,-\frac{1}{5})$ and $(4,\frac{1}{5})$

$(-2,\frac{1}{4})$ and $(2,-\frac{1}{4})$

$\(\left\)(-2,-\(\frac\)14\(\right\))$ and $\(\left\)(2,\(\frac\)14\(\right\))$