Determine Any Points on the Graph of the Following Function $$f ( x ) = x ^ { 2 } + 6 x - 8$$

Multiple Choice

Determine any points on the graph of the following function at which the tangent line is horizontal.
$$f ( x ) = x ^ { 2 } + 6 x - 8$$

A) $( 3,19 )$
B) $( 3,0 )$
C) $( - 3,0 )$
D) $( 1 , - 1 )$
E) $( - 3 , - 17 )$