正解:A
Basic Concept: This question tests high availability and disaster recovery design for Azure SQL, SQL Server on Azure VMs, and regional failure scenarios.
Why A is Correct: auto failover groups is correct because it is the feature whose normal purpose matches the stated requirement. Auto-failover groups provide managed geo-replication and listener-based failover for Azure SQL Database or Managed Instance, including automatic failover policies for regional outages. The scenario wording points to that specific behavior: You need to implement a disaster recovery solution for SQL1.
Why B is Wrong: Azure Site Recovery is part of the availability or recovery design space, but the correct choice must satisfy the specified failover, restore, quorum, RPO, or RTO requirement. It handles a different resilience pattern and would not deliver the failover or recovery behavior required here.
Why C is Wrong: availability groups is part of the availability or recovery design space, but the correct choice must satisfy the specified failover, restore, quorum, RPO, or RTO requirement. It is not wrong technology in general, but it is the wrong HA/DR control for this scenario ' s failure model.
Why D is Wrong: active geo - replication is part of the availability or recovery design space, but the correct choice must satisfy the specified failover, restore, quorum, RPO, or RTO requirement. It does not meet the failover, restore, quorum, or cross-region continuity target stated in the question, even if it is valid in a different availability design.