Geometry

The answer is D.at least 3.

In geometry, a plane is a two-dimensional flat surface that extends infinitely. To define a unique plane in three-dimensional space, you need at least three non-collinear points. If you have only one point, it just represents a location and does not define a plane. With two points, you can define a line, but not a plane. However, when you have three points that are not all on the same line (non-collinear), there is exactly one plane that passes through those three points.