Which of the following statements are always correct? (1) If f is not continuous at x=a, then the graph of f has a sharp corner at x=a. (2) If f is not continuous, then f is not differentiable. (3) If f is not differentiable at x-a, then the graph of f has a sharp corner at x=a. O (1) (2) (3) O (1) and (2) O (1) and (3) (2) and (3) all of them

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