Which method should the solution architect select?

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

Which method should the solution architect select?
A . Configure amazon DynamoDB Accelerator (DAX) for the new messages table. Update the code to use DAX endpoint.
B . AddDynamoDB read replicas to handle the increased read lead 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 of DynamoD

Answer: A