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For the function, find the points on the graph at which the tangent line is horizontal. If none exist, state that fact. st y = 3x - 3 List all the points where the tangent line is horizontal. Select the correct choice below and, if necessary, fill in the answer box to complete your choice PI O A. The point(s) at which the tangent line is horizontal is(are) (Type an ordered pair. Use a comma to separate answers as needed.) O B. The tangent line is horizontal at all points of the graph. O C. There are no points where the tangent line is horizontal