Which term refers to a network resource in the directory?

The term that is most appropriate for referring to a network resource in the directory is "Object." In directory services, an object represents a distinct entity with attributes and properties, which can include users, computers, printers, or other resources within a network environment. Each object is uniquely identified and can be manipulated and managed according to its attributes.

In contrast, other terms such as "Organizational unit" refer to a specific type of object designed to contain other objects, allowing for better management and delegation of administrative tasks. "Domain" relates to a collection of objects that share a common directory database, while "Tree" refers to a hierarchical arrangement of domains in Active Directory. Thus, while these terms relate to directory structure and organization, "Object" is specifically the term that directly represents a network resource within that context.