$\frac{1}{4}-\frac{5}{4 \cdot 8}+\frac{5 \cdot 9}{4 \cdot 8 \cdot 12}-\ldots=$

  • A
    $\frac{3 \sqrt{3}-2 \sqrt{5}}{9 \sqrt{3}}$
  • B
    $\frac{2 \sqrt{3}-3 \sqrt{2}}{9 \sqrt{3}}$
  • C
    $\frac{2^{\frac{1}{4}}-1}{2^{\frac{1}{4}}}$
  • D
    $\frac{2 \sqrt{3}-3 \sqrt{5}}{9 \sqrt{3}}$

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