Which load type allows adding features to a feature class that are point, line, or polygon but are not network feature classes?

The correct choice is Simple Data Loader. This load type is specifically designed to add simple geographic features—point, line, or polygon—to a feature class. It excels in situations where you want to integrate new data into existing layers without the complexities involved with features that might require additional attributes or network capabilities.

The Simple Data Loader facilitates a straightforward and efficient process for importing these features, ensuring that they conform to the target feature class schema. This means that regardless of the source of the data, the Simple Data Loader can handle the addition of these types of features seamlessly, turning the task into a streamlined operation.

Considering the context of the other choices, while the Object Loader is used for more complex data management involving feature classes with attached objects, it is not tailored specifically for simple features. The Append w/ Test Mode option is primarily used for appending data but includes validation checks that might complicate situations where straightforward additions are needed. Lastly, the Data Loader generally functions for bulk loading complex structured data which may not specifically emphasize the nature of the features involved, such as simple geometric types.