If $f(x) = \operatorname{Max} \{3 - x, 3 + x, 6\}$ is not differentiable at $x = a$ and $x = b$,then $|a| + |b| =$

  • A
    $4$
  • B
    $5$
  • C
    $6$
  • D
    $8$

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