$\lim _{y \rightarrow 0} \frac{\sqrt{1+\sqrt{1+y^4}}-\sqrt{2}}{y^4} = $

  • A
    $0$
  • B
    $\frac{1}{2 \sqrt{2}}$
  • C
    $\frac{1}{4 \sqrt{2}}$
  • D
    $\frac{1}{2 \sqrt{2}(\sqrt{2}+1)}$

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