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(1 point) Given the graph of y = f(x) below, at which of the marked x-values can the following statements be true? x1 *2 x4 x5 (For each question, enter your answer as a comma-separated list, e.g., x1,x3,x5. Enter none if no points satisfy the given condition) A. f(x) > 0 at x = B. f' (x) > 0 at x = C. f(x) is increasing at x = D. The slope of f (x) is negative at x =