The graph of the derivative f' of a continuous function f is shown below. (Assume the function f is defined only for 0 < x < 9.) y=f'(x) (c) On what interval(s) is f concave upward? (Select all that apply.) □ (0, 2) ☐ (0,3) □ (0, 6) □ (2,4) ☐ (3,6) □ (2, 6) ☐ (6,9) ☐ (5,9) ☐ (0,9) none of these

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