For the function, find the point(s) on the graph at which the tangent line is horizontal.
y=x^3-14x^2+9x+9
Select the correct choice below and if necessary, fill in the answer box to complete your choice.
a. The point(s) at which the tangent line is horizontal is(are___
b. The tangent line is horizontal at all points of the graph
c. There are no points on the graph where the tangent line is horizontal.
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