If $y = x + e^x$,then $\frac{d^2x}{dy^2}$ is:

  • A
    $e^x$
  • B
    $-\frac{e^x}{(1 + e^x)^3}$
  • C
    $-\frac{e^x}{(1 + e^x)^2}$
  • D
    $\frac{-1}{(1 + e^x)^3}$

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