Final answer:
Trust relationships allow administrators to grant users in one domain access to resources of another domain within the same domain tree.
Step-by-step explanation:
The administrators can grant users in one domain access to resources of another domain within the same domain tree through trust relationships. Trust relationships allow domains to share resources and security information by establishing a trusted connection between them.
For example, in a multi-domain environment using Active Directory, administrators can create a trust relationship between two domains to grant users from one domain access to resources in the other domain. This allows users to authenticate and access resources across domains without needing separate user accounts.
Trust relationships can be one-way or two-way, and they are typically managed by the administrators of the domains involved.