Correct answer - "DynamoDB" : Amazon DynamoDB is a no relational database that delivers reliable
performance at any scale. It is a fully managed, multi-region, multi-master database that
provides consistent single-digit millisecond latency.
Incorrect:
"RDS" - Its use for relational storage and not NoSQL
"Redshift" - Redshift is a petabyte scale warehouse service and you have to manually change
settings for scaling
"ElastiCache" - Good for in-memory caching and helps significantly improve latency