At the point $x=1$,the function $f(x) = \begin{cases} x^3-1, & 1 < x < \infty \\ x-1, & -\infty < x \leq 1 \end{cases}$ is

  • A
    continuous and differentiable
  • B
    continuous and not differentiable
  • C
    discontinuous and differentiable
  • D
    discontinuous and not differentiable

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