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Which method should the solutions architect select?

A company has a mobile chat application with a data store based in Amazon DynamoDB. Users would like new messages to be read with as little latency as possible. A solutions architect needs to design an optimal solution that requires minimal application changes.

Which method should the solutions architect select?
A . Configure Amazon DynamoDB Accelerator (DAX) for the new messages table. Update the code to use the DAX endpoint.
B . Add DynamoDB read replicas to handle the increased read load. Update the application to point to the read endpoint for the read replicas.
C . Double the number of read capacity units for the new messages table in DynamoD
D . Continue to use the existing DynamoDB endpoint.
E . Add an Amazon ElastiCache for Redis cache to the application stack. Update the application to point to the Redis cache endpoint instead of DynamoD

Answer: A

Explanation:

https://aws.amazon.com/blogs/database/how-to-increase-performance-while-reducing-costs-by-using-amazon-dynamodb-accelerator-dax-and-aws-lambda/

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