When does the equation $ax^2 + 2hxy + by^2 + 2gx + 2fy + c = 0$ represent an ellipse?

  • A
    $\Delta = 0, h^2 < ab$
  • B
    $\Delta \neq 0, h^2 < ab$
  • C
    $\Delta \neq 0, h^2 > ab$
  • D
    $\Delta \neq 0, h^2 = ab$

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