Your team plans to configure a distributed in-memory data store in Amazon ElastiCache for Redis. The Redis node type is M5. Your manager asks you to ensure that the Redis datastore has very high performance with low network latency. Which of the following options helps to achieve the requirement?

Answer options:

A.Cluster Mode enabled in the ElastiCache cluster.
B.Replacing the node type with R4.
C.Multi-threading in the ElastiCache Redis cluster.
D.Enhanced I/O handling in the ElastiCache cluster.

Correct Answer: D
Option A is incorrect because ElastiCache for Redis with cluster mode enabled can enhance reliability and availability. But the network throughput is not improved.
Option B is incorrect because the R4 node type is Memory-optimized. It may not help to improve the network performance at all.
Option C is incorrect because Multi-threading is only supported in ElastiCache Memcached instead of Redis. For details, please check https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/SelectEngine.html.
Option D is CORRECT because enhanced I/O handling in ElastiCache Redis can boost the Redis performance with very low latencies. This feature is available in all AWS regions.
References:
https://aws.amazon.com/blogs/database/boosting-application-performance-and-reducing-costs-with-amazon-elasticache-for-redis/,
https://aws.amazon.com/about-aws/whats-new/2019/03/amazon-elasticache-for-redis-503-enhances-io-handling-to-boost-performance/?nc1=h_ls,
https://docs.aws.amazon.com/AmazonElastiCache/latest/mem-ug/SelectEngine.html