What type of capability did Diego enable on a Windows Server?

Enabling a server feature on a Windows Server generally refers to adding optional components that enhance the functionality of the server. These features can include things like the Windows Network Load Balancing feature, the Print and Document Services feature, or others that improve the server's capabilities without being a core role. Features are often lightweight additions that provide specific functionalities and can be added or removed based on the server's needs.

In contrast, a server role is a more comprehensive service that the server is configured to perform. For instance, roles like Active Directory Domain Services or Web Server (IIS) dictate the primary purpose or primary function of that server within a network.

Network service typically indicates a service that operates over a network, but it doesn't fully describe the configuration aspect on the Windows Server. As for client applications, they are software designed for end-users to interact with servers, rather than being a part of the Windows Server's core capabilities.

Therefore, enabling a server feature demonstrates the addition of specific functionalities that supplement the server's roles, aligning with the characteristics of modular enhancements within the Windows operating environment.