A company currently has an application that works with DynamoDB. The application is a high revenue generating application for the company. Their current response time for their read workloads is in the order of milliseconds. But to bump up hits to their pages, they want to reduce the response time to microseconds. Which of the following would you suggest to be most preferably used with DynamoDB to fulfill this requirement?

Answer options:

A.Consider deploying an ElastiCache in front of DynamoDB.B.Consider using DynamoDB global tables.
C.Consider using DynamoDB accelerator.
D.Consider using a higher throughput for the tables.

Answer – C
The AWS Documentation mentions the following.
DynamoDB Accelerator(DAX) is a DynamoDB-compatible caching service that enables you to benefit from fast in-memory performance for demanding applications. DAX addresses three core scenarios.
As an in-memory cache, DAX reduces the response times of eventually-consistent read workloads by order of magnitude, from single-digit milliseconds to microseconds.
DAX reduces operational and application complexity by providing a managed service that is API-compatible with Amazon DynamoDB. Thus it requires only minimal functional changes to use with an existing application.
Option A is invalid because ElastiCache would not guarantee for certain such a great reduction in response times. The question also asks for a "preferred" service to be used along with DynamoDB, for which DAX would be a better answer than Elasticache.
Option B is invalid because it is used when you want to make replicas of the tables in different regions.
Option D is invalid because this option is used only when you have throttling errors for the table.
For more information on DAX, please refer to the below URL-
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/DAX.html