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AWS Certified Solutions Architect - Associate · AWS
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B: Warm Standby is better when it comes to LOWEST RTO. https://docs.aws.amazon.com/whitepapers/latest/disaster-recovery-workloads-on-aws/disaster-recovery-options-in-the-cloud.html
"Different Region" rules out C and D ("Multi-AZ" is within a region) "Run at reduced capacity" = warm standby (while "pilot light" means that DR resources are shut down and are started manually in case of failover)
The warm standby approach involves ensuring that there is a scaled down, but fully functional, copy of your production environment in another Region. With the pilot light approach, you replicate your data from one Region to another and provision a copy of your core workload infrastructure. Resources required to support data replication and backup, such as databases and object storage, are always on. Other elements, such as application servers, are loaded with application code and configurations, but are "switched off".