यदि $f(x) = f'(x) + f''(x) + f'''(x) + \ldots$ और $f(0) = 1$ है,तो $f(x)$ किसके बराबर है?

  • A
    $e^{x / 2}$
  • B
    $e^{x}$
  • C
    $e^{2 x}$
  • D
    $e^{4 x}$

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