When does the equation $x^2 + y^2 + 2gx + 2fy + c = 0$ represent a point circle?

  • A
    $g^2 + f^2 = c$
  • B
    $g^2 + f^2 + c = 0$
  • C
    $g^2 + f^2 > c$
  • D
    None of these

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