Where are Spline Handles located in a spline?

The correct choice emphasizes that spline handles are located at every control point and every endpoint of the spline. In SolidWorks, splines are defined by control points that determine their shape and curvature. The handles associated with these control points allow users to manipulate the spline more intricately.

When you add control points to a spline, each control point will have a handle that can be adjusted to change the direction and extent of the curve at that point. Additionally, the endpoints of the spline also have handles, allowing for adjustments to be made at the very ends of the spline. This capability is crucial because it provides the user with the flexibility to shape the spline in a very specific manner, by both altering the positioning of control points and adjusting the handles to manipulate how the spline curves through space.

The other choices do not accurately capture this functionality. For example, stating that the handles are only at the start and end of the spline or only at control points overlooks the fact that both sets of points have handles for manipulation. Understanding this structure is fundamental for effectively using splines in design and ensuring the desired curves and shapes are achieved in SolidWorks.