What is one of the key features of the User Defined Source?

The correct choice highlights that a key feature of the User Defined Source in Tanium is that it can be deleted. This flexibility is important for managing the data sources that are tailored to the needs of an organization. When administrators create a User Defined Source, they have the autonomy to modify or remove data sources as necessary to ensure that the information being used is relevant and up-to-date. This ability to delete sources contributes to better data management and helps maintain the integrity of the data within Tanium.

The other choices do not accurately describe significant features of the User Defined Source. For instance, while there may be controlled permissions regarding who can view or modify certain data, the ability to delete is a unique aspect that sets it apart from sources that are automatically imported or are set to read-only status.