Let $f$ and $g$ be two functions defined by $f(x) = \begin{cases} x+1, & x < 0 \\ |x-1|, & x \geq 0 \end{cases}$ and $g(x) = \begin{cases} x+1, & x < 0 \\ 1, & x \geq 0 \end{cases}$. Then $(g \circ f)(x)$ is

  • A
    Differentiable everywhere
  • B
    Continuous everywhere but not differentiable exactly at one point
  • C
    Not continuous at $x = -1$
  • D
    Continuous everywhere but not differentiable at $x = 1$

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