Will any linear combination of degree 3 b-splines be C2 continuous?

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Question is as in title. I have read that natural cubic splines are always C2 continuous, but am unsure whether all cubic splines are.

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Not all degree 3 B-splines are $C^2$ continuous. They could be $C^1$ or even $C^0$ depending on the knot vector (or more specifically the knot multiplicities).