If $f$ is a polynomial,then the second derivative of $f(e^x)$ is

  • A
    $f'(e^x)$
  • B
    $f''(e^x)e^x + f'(e^x)$
  • C
    $f''(e^x)e^{2x} + f''(e^x)$
  • D
    $f''(e^x)e^{2x} + f'(e^x)e^x$

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