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6 For the function. nd the points on the graph at which the tangent line is horizontal. if none exist, state that fact. % l 11 f(x)=6x2-2x+4 ' "' c M 1 Select the correct choice below and, if necessary, ll in the answer box within your choice. O A The point(s) at which the tangent line is horizontal is (are) D (Simplify your answer. Type an ordered pair. Use a comma to separate answers as needed.) 0 B. There are no points on the graph where the tangent line is horizontal. O C. The tangent line is horizontal at all points of the graph