If $\alpha$ and $\beta$ are the least positive integers such that for all $n \in N$,$n^3+\alpha n$ is divisible by $3$ and $n^3-\beta n$ is divisible by $6$,then $\alpha+\beta=$

  • A
    $4$
  • B
    $3$
  • C
    $2$
  • D
    $1$

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