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Based on the theorem "Differentiability \(\implies\) Continuity", which of the following statements is always true?
If \(f\) is continuous at \(a\), then it must be differentiable at \(a\).
If \(f\) is not continuous at \(a\), then it cannot be differentiable at \(a\).
If \(f\) is not differentiable at \(a\), then it cannot be continuous at \(a\).
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