Your web-based application uses a large RDS data store to write and read user profile information. The latest marketing campaign has increased traffic to the application by an order of magnitude. Users are reporting long delays when logging in after having signed up. Which solutions are valid approaches to addressing this lag? (Choose two.)
A. Set up a Multi-AZ configuration for your RDS and round-robin requests between thetwo RDS instances to spread out traffic.
B. Employ ElastiCache to cache users’ credentials after their initial visit to reduce trips to the database from the web application.
C. Set up a read replica configuration for your RDS and round-robin requests between all the replicas to spread out traffic.
D. Increase the number of EC2 instances allocated to your Auto Scaling group to spread out traffic on the web application tier.
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