If $a^2 x^4 + b^2 y^4 = c^6$,then the maximum value of $xy$ is:

  • A
    $\frac{c^3}{2ab}$
  • B
    $\frac{c^3}{\sqrt{2ab}}$
  • C
    $\frac{c^3}{ab}$
  • D
    $\frac{c^3}{\sqrt{ab}}$

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