An application repeatedly issues the same expensive read queries to an RDS database, causing high latency under load. Which service reduces database load and improves read latency with minimal app changes?
A) Amazon ElastiCache.
B) AWS Glue.
C) Amazon Athena.
D) A larger EBS volume on the database.
Correct Answer: A
Explanation: Amazon ElastiCache (Redis or Memcached) caches frequent query results in memory, serving repeated reads in sub-millisecond time and offloading the database. (B) Glue is ETL. (C) Athena queries S3 data. (D) more storage doesn’t address repeated read latency.