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On which of the following intervals is the graph of f(a) = In(ac) - 3x, always concave down? Note: The domain of f(x) is {x

On which of the following intervals is the graph of f(a) = In(ac) - 3x, always concave down? Note: The domain of f(x) is {x | x > 0} a) (3, 0o) O b) (0, co) O c) ( - 00, 00) O d) ( -00, 0) Oe) None of the above

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