A DynamoDB-backed application has read-heavy traffic and needs microsecond response times for repeated reads, without re-architecting the app’s DynamoDB API calls. What should be added?
A) Amazon DynamoDB Accelerator (DAX).
B) An RDS read replica.
C) Amazon Redshift.
D) A larger DynamoDB table.
Correct Answer: A
Explanation: DAX is an in-memory cache purpose-built for DynamoDB, delivering microsecond read latency through an API-compatible layer with minimal app changes. (B) read replicas are an RDS feature. (C) Redshift is an analytics data warehouse. (D) table “size” isn’t a performance lever here.