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) $( - 4 , - 24 )$