What is the network directory service developed by Microsoft called?

The network directory service developed by Microsoft is known as Active Directory. This service provides a means to manage and store information about network resources, including users, computers, and services, within a decentralized directory structure. Active Directory enables administrators to organize different resources in a hierarchical framework, allowing for efficient management, security, and deployment of both user and computer data across an organization's network.

With Active Directory, businesses can implement various important security measures such as authentication and authorization services. It supports group policies and can integrate with various applications, enhancing both user management and resource access controls.

The other choices reflect different directory services, but not one developed by Microsoft. Oracle Directory Service pertains to Oracle's own solutions, while LDAP (Lightweight Directory Access Protocol) is a standard protocol used for accessing directory services and is not exclusive to Microsoft. Finally, Microsoft Network Service is not recognized as a directory service but more like a component that might refer to different networking functionalities within Microsoft systems. Active Directory, however, stands out as the definitive directory service from Microsoft, focused on enterprise-wide deployment and network resource management.