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The equaiton ax^2 + by^2 + 2hxy + 2gx + ...

The equaiton `ax^2 + by^2 + 2hxy + 2gx + 2fy + c = 0` represents a circle if (A) `a=b, h = 0, g^2 + f^2 - c gt0` (B) `a=b, h = 0` (C) `a=b, h=0, g^2 + f^2 - cge 0` (D) none of these

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