How to determine what kind of curve in 3d geometry

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I am having difficulty in determining type of given curve in 3d geometry.Is there any test in which I can differentiate between

1) Circle

2) Cone

3) Cylinder

4) Circle

When equation of 3d curve is given as $ax^2 +by^2 + cz^2 + dx + ey + fz + g=0 $