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$6 14860) 2 Consider the proposition below. Of the options provided, which sentence could be used to begin a proof by contradiction (Select all that apply) * (10 Points) Proposition. f (x) differentiable at a = f (x) continuous at a. Suppose f (x) is differentiable at a but that f (x) is not continuous at a. Suppose f (x) is not differentiable at a. Suppose f (x) is either differentiable at a or that f (x) is continuous at a Suppose f (x) is not continuous at a and that f (x) is differentiable at a Suppose f (x) is neither differentiable nor continuous at a 3