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AWS Certified Solutions Architect - Associate · AWS
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elastic cache redis and memcached as mentioned in option A and D though supported by , it is not recommended with non sql database as Dynamo DB as it simply leads to more application changes with more hassle. And replicating data with global tables will make your job even cumbersome, so dont do it. i will go with option B
Use the turbo
B: https://aws.amazon.com/dynamodb/dax/ improve 10x performance (marketing pitch on above link) with fully managed service so no reconfiguration or operational overhead involved.