Which statement is true when creating or moving the defining points of a Studio Spline?

When working with a Studio Spline in Siemens NX, the defining points are integral to the shape and configuration of the spline. When a defining point is moved, the spline curve updates dynamically in real-time, allowing for immediate visual feedback. This feature is particularly useful in design scenarios, as it enables designers to see the effects of their modifications instantly, facilitating an iterative design process without the need for additional steps or manual updates.

In contrast, the other statements suggest limitations that do not reflect how Siemens NX handles spline manipulation. There is no need for manual updates, points can indeed be moved after creation, and multiple defining points can be manipulated simultaneously. Understanding this dynamic behavior is crucial for efficiently utilizing splines in design workflows.