If $f$ is defined by $f(x) = \begin{cases} x & \text{for } 0 \leq x < 1 \\ 2-x & \text{for } x \geq 1 \end{cases}$,then at $x=1$,$f(x)$ is

  • A
    continuous and differentiable
  • B
    continuous but not differentiable
  • C
    discontinuous but differentiable
  • D
    neither continuous nor differentiable

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