Which Azure solution provides near-instant failover for mission-critical applications across different regions?

Azure Site Recovery (ASR) is the correct answer because it orchestrates replication, failover, and recovery of virtual machines and physical servers, providing business continuity and disaster recovery for mission-critical applications with near-instant failover capabilities across different Azure regions or on-premises to Azure. Azure Backup is incorrect because it focuses on data backup and restoration, not continuous replication and failover for disaster recovery. Availability Zones are incorrect because they provide high availability within a single Azure region by isolating failures, but they don't offer cross-region disaster recovery with near-instant failover. Azure Blob Storage is incorrect as it's an object storage solution and does not provide disaster recovery orchestration for applications.