Find the condition for the curves $\frac{x^2}{a^2} - \frac{y^2}{b^2} = 1$ and $xy = c^2$ to intersect orthogonally.

  • A
    $a^2 + b^2 = 0$
  • B
    $a^2 = b^2$
  • C
    $a^2b^2 = 0$
  • D
    $a^2 = -b^2$

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