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AWS Certified Developer - Associate · AWS
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A is the correct answer.
Amazon ElastiCache provides a fast, in-memory data store or cache. It is often used for session management in distributed applications. Data stored in ElastiCache can be accessed quickly and reliably by any of the EC2 instances behind the ELB, making it an ideal choice for session data that needs to be shared across multiple servers.
A is correct. By storing session data in ElastiCache, you ensure that regardless of which EC2 instance handles a given request, the session data can be consistently and rapidly accessed.