If $y = 1 + \frac{x}{1!} + \frac{x^2}{2!} + \frac{x^3}{3!} + \dots \infty$,then $x = $
- A$\log_e y$
- B$\log_e \frac{1}{y}$
- C$e^y$
- D$e^{-y}$
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