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AWS Certified Solutions Architect - Associate · AWS
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D is correct Set up an Aurora global database for the DB cluster. When setup is complete, remove the DB instance from the secondary Region. The reason why B us incorrect! Reason it's incorrect: Removing the DB instance from the secondary region would defeat the purpose of having a disaster recovery setup. Without a DB instance in the secondary region, you lose the ability to quickly failover in case of a regional outage, which is critical for DR.
This makes the answer D - "a high-volume software as a service (SaaS) platform."
When you set up an Aurora Global Database, the storage layer (Aurora Storage) is continuously and automatically replicated across Regions — independent of whether you have DB instances (readers/writers) running in the secondary Region. If you remove the DB instance from the secondary Region: The replicated storage remains. No compute (no DB instances) = No cost for compute, only storage costs. BUT: In a real failover event, you must promote the secondary cluster. When you promote, you must first create a new DB instance in the secondary Region from the existing storage. This takes some time (typically a few minutes), because Aurora has to spin up the DB instance.