If a twice differentiable function f has exactly three zeros, at x=1, x=2 and x=3, then which of the following can we necessarily conclude? Select all that apply. O f' has at least two zeros in the interval (1,3). O f' has exactly one zero in the interval (1,3). O f' is never zero on the interval (1,3). O f" has at least one zero in the interval (1,3). O f" is never zero on the interval (1,3).

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