Determine Any Points on the Graph of the Following Function $f(x)=x^{2}+8 x-8$

Multiple Choice

Determine any points on the graph of the following function at which the tangent line is horizontal. $f(x) =x^{2}+8 x-8$

A) $(4,40)$
B) $(4,0)$
C) $(-4,0)$
D) $(0,-8)$
E) $\quad(-4,-24)$