C. They lie in the same plane
D. They are collinear
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A set of 3 points will always be coplanar, but will only sometimes be collinear. Collinear points are always coplanar as well.
Parallel lines are ALWAYS coplanar.
always
Yes, two points are always collinear. You can draw a line through any two points.
2 points determine a straight line and are always, by definition, collinear.