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Inis lest: 22 pts possible Submit T For the function, find the points on the graph at which the tangent line is horizontal. If none exist, state that fact. y= - 0.04x -0.8x + 60 . . . .. 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. O A. The point(s) at which the tangent line is horizontal is (are) (Simplify your answer. Type an ordered pair. Use a comma to separate answers as needed.) O 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. annd O .1-1.8