$\lim _{x \rightarrow \infty} x^3 \left\{\sqrt{x^2+\sqrt{1+x^4}}-x \sqrt{2}\right\} = $

  • A
    $\frac{1}{\sqrt{2}}$
  • B
    $\frac{1}{4 \sqrt{2}}$
  • C
    $\frac{-1}{4 \sqrt{2}}$
  • D
    $\frac{-1}{\sqrt{2}}$

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