What differentiates the three levels of domain separation?

The correct choice highlights that the three levels of domain separation are primarily differentiated by the complexity and segregation of data. Each level of domain separation provides varying degrees of isolation and control over data access and visibility, allowing organizations to manage how data is shared or restricted between different departments or business units.

In the case of domain separation, the first level typically provides minimal segregation, with some shared access to data. The second level enhances this separation, allowing for more defined boundaries between different domains, while the third level offers complete isolation of data, ensuring that information is fully segregated and accessible only to specific users or roles.

The other options are less relevant to the differentiation of domain separation levels. While the number of roles assigned or the types of users in each domain can impact how data is accessed, they do not inherently define the levels of complexity or segregation related to the domain separation itself. Similarly, catalog item visibility, while important in other contexts, does not serve as a primary differentiating factor for the levels of domain separation.