The correct answer is Azure AD Connect. It is the tool Microsoft recommends to keep on premises Active Directory identities synchronized with Azure AD.

Azure AD Connect provides built in synchronization features such as password hash synchronization, pass through authentication, federation integration, writeback options, and filtering rules. It also supports staging mode and integrates with monitoring and health features so administrators can manage and troubleshoot the hybrid identity environment.

Azure DevOps is a development and CI CD platform and it does not perform directory synchronization between on premises Active Directory and Azure AD.

Google Cloud Directory Sync is a Google tool for syncing LDAP or Active Directory accounts to Google Workspace or Cloud Identity and it is not used for syncing to Azure AD.

Azure Logic Apps is a workflow automation service and it is not the vendor recommended solution for directory synchronization.

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