$\lim _{x \rightarrow 0} \frac{63^x-9^x-7^x+1}{\sqrt{2}-\sqrt{1+\cos x}}=\ldots$.

  • A
    $\frac{4 \sqrt{2}}{\log 7 \cdot \log 9}$
  • B
    $4 \sqrt{2} \log 7 \cdot \log 9$
  • C
    $4 \sqrt{2} \log 63$
  • D
    $\frac{\log 7 \cdot \log 9}{4 \sqrt{2}}$

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