For the equation $ax^2 + 2hxy + 3y^2 + 4x + 8y - 6 = 0$ to represent a circle,what must be the values of $a$ and $h$?

  • A
    $a = 3, h = 0$
  • B
    $a = 1, h = 0$
  • C
    $a = h = 3$
  • D
    $a = h = 0$

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