What option is used to create a spline that is defined by using the average of selected points?

The option that allows you to create a spline defined by the average of selected points is referred to as "By Poles." When you select points that you want to use for creating the spline, the "By Poles" method calculates the curve by averaging the positions of these selected points, generating a smooth, continuous spline that best represents the overall shape defined by the points. This is particularly useful in creating aesthetically pleasing curves that align closely with the user-defined data points.

In contrast, the other methods present different ways to generate splines. "Through Points," for instance, creates a spline that exactly passes through the specified points, which may not necessarily generate a smooth average curve. The "By Nodes" option allows for defining the spline based on a series of specified coordinates, while "Exact Spline" typically refers to a spline that adheres precisely to the selected points without averaging, resulting in a different characteristic than what is achieved through averaging points. Each of these alternatives serves distinct purposes in spline creation, further supporting the utility of the "By Poles" option for this context.