Which type of Azure Pipelines check should be configured to query Azure Boards and confirm there are no active work items before deploying a build to production?

Pre-deployment gates are the correct choice because they allow for automated, programmatic checks to be performed before a stage in a release pipeline begins. In this scenario, a gate can be configured to query Azure Boards using an Azure Function or REST API call to ensure no active work items (e.g., bugs, critical issues) exist that would prevent a safe production deployment. Post-deployment approvals and pre-deployment approvals are manual steps requiring human intervention, which doesn't fit the requirement for an automated check. Manual validations are also a manual step within a pipeline, not an automated gate.