Let $f(x) = x^2 e^{-2x}, x > 0$. The maximum value of $f(x)$ is

  • A
    $0$
  • B
    $\frac{1}{e^2}$
  • C
    $\frac{1}{4e^2}$
  • D
    $\frac{1}{2e}$

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