What type of reference plane is NOT created by the user?

The base reference plane is not created by the user, as it is predefined by Solid Edge to establish the initial coordinate system and geometric framework for the part or assembly being designed. This built-in reference plane serves as a fundamental point of reference, allowing users to efficiently create and position features within their models without needing to define it manually. The base reference plane typically includes the standard planes, such as the front, top, and right planes, which provide a consistent foundation for sketching and modeling.

In contrast, the other types of reference planes—user-defined reference planes, default reference planes, and custom reference planes—are created or configured by users to meet specific design needs or preferences, allowing for greater flexibility in the modeling process.