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Hi Raj,
Thank you for posting your question. The scenario clearly said that the website has read-heavy database workloads and it needs to increase the read throughput of the database. These key phrases warrant the use of Read Replicas:
https://aws.amazon.com/rds/features/read-replicas/
It is true that a Read Replica replicates data from the master to the replica asynchronously, while Multi-AZ nodes do this synchronously. But the replication process is of no relevance in the scenario at all. The main issue here is the read performance of your application. An RDS database will still be ACID-compliant even it has Read Replicas or in an Multi-AZ deployments configuration.
Let us know if you need further assistance. The Tutorials Dojo team is dedicated to help you pass your AWS exam on your first try!
Regards,
Jon Bonso @ Tutorials Dojo
