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An Active Directory client uses the Global Catalog to locate objects in another domain because the Global Catalog holds a partial replica of all objects in an Active Directory forest. This means that it contains essential information about every object, including user accounts and groups, typically stored in multiple domains. The Global Catalog allows clients to perform searches across the entire forest without needing to know the specific domain in which an object resides. This makes finding objects across domains efficient and enhances the overall functionality of Active Directory in a multi-domain environment.

While Domain Controllers manage authentication and directory services within a specific domain, and LDAP is a protocol used to access directory services, they are not specifically designed to navigate across domains as effectively as the Global Catalog. Similarly, while DNS servers provide name resolution services necessary for locating domain controllers, they do not directly assist in locating Active Directory objects. Therefore, the Global Catalog serves as a vital component in multi-domain environments for streamlined object location and retrieval.