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Which database read-scaling primitive lets an Amazon RDS or Aurora cluster offload read-only queries from the primary instance?
ARead replicas
BS3 Transfer Acceleration endpoints
CMulti-AZ failover targets (which are standby only and not readable)
DDynamoDB global secondary indexes
Answer & Solution
Correct answer: A. Read replicas
Read replicas serve read traffic and offload the primary. Multi-AZ standbys exist for failover, not reads (with RDS for MySQL/Postgres — Aurora's Multi-AZ readers are different). DynamoDB GSIs are an unrelated NoSQL concept; S3 TA isn't a database feature.
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