Triple

Target entity: Active Directory
Context triple: [Proxmox VE, supportsAuthenticationBackend, Active Directory]

• A. Active Directory chosen
  Active Directory is Microsoft's centralized directory and identity management service used to authenticate and authorize users, computers, and resources in Windows-based networks.
• B. Active Directory Lightweight Directory Services
  Active Directory Lightweight Directory Services is a flexible, standalone LDAP directory service from Microsoft that provides directory capabilities without requiring full Active Directory domain infrastructure.
• C. Azure Active Directory
  Azure Active Directory is Microsoft’s cloud-based identity and access management service that provides authentication, single sign-on, and directory services for users, applications, and resources.
• D. LDAP
  LDAP (Lightweight Directory Access Protocol) is an open, standards-based protocol used to access and manage distributed directory information services over an IP network.
• E. Active Directory Certificate Services
  Active Directory Certificate Services is a Windows Server role that provides public key infrastructure (PKI) functionality for issuing, managing, and validating digital certificates within an organization’s network.
• F. None of above.
• G. Unsure - the case is ambiguous/there is not enough information to decide.