What is a reference plane? A. A plane that the auxiliary view shares with one or more other views B. A plane that the auxiliary view does not share C. A plane that makes it harder to determine distances between lines D. A plane that can't be parallel to any other lines in the project

A reference plane is a plane in 3D space used as the workspace for drawing and the basis for other interactive actions. The initial reference plane is the XY plane (or ground plane). The reference plane may be one of the three Cartesian planes (XY, YZ, ZX), or it may be a custom plane.