$\left( {1 + \frac{1}{{2!}} + \frac{1}{{4!}} + \dots} \right) \left( {1 + \frac{1}{{3!}} + \frac{1}{{5!}} + \dots} \right) = $

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

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