If $X$ is a Poisson variate such that $\alpha = P(X=1) = P(X=2)$, then $P(X=4)$ is equal to

  • A
    $2 \alpha$
  • B
    $\frac{\alpha}{3}$
  • C
    $\alpha e^{-2}$
  • D
    $\alpha e^2$

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