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Yeah, I checked this. The answer key is actually correct because the question says there are no Aurora Replicas.
For Aurora failover:
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If an Aurora Replica exists, Aurora promotes that existing replica to the new primary.
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If there is no Aurora Replica, Aurora creates/recreates a new DB instance in the same AZ as the failed primary.
So my original answer about promoting a healthy replica would only be correct if the question mentioned that a replica was available. The confusing part is that Aurora’s underlying storage is already replicated across AZs, but without a replica there isn’t a standby DB instance to promote.
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