Let f (x) = x logą x. The graph of f is concave upward on the interval (0, 0) if the base a is in the interval ㅇ (-8, 08) ㅇ (-8, r) ㅇ (-8, r] ㅇ (r, o) O (-r, ∞) ㅇ (-8, r) U (s, 8) O (-~, r] U [s, ») O (r, s) O [r, s] O None r = S = The graph of f is concave downward on (0, ∞) if the base a is in the interval ㅇ (-0, 08) ㅇ (-8, t) O (-∞, t] O (t, o) O [t, 0) O (-∞, t) U (u, ∞) O (-∞, t] U [u, ∞) O (t, u) O [t, u] O None %3D

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