Your application has the requirement to store data in a backend data store. Indexing should be possible on the data, but the data does not conform to any schema. Which of the following would be the ideal data store to choose for this application?

Answer options:

A.AWS RDS
B.AWS DynamoDB
C.AWS Redshift
D.AWS S3

Answer – B
The below AWS Documentation mentions the differences between AWS DynamoDB and other traditional database systems. One of the major differences is the schemaless nature of the database.
Option A is invalid since this is normally used for databases that perform to a particular schema.
Option C is invalid since this is normally used for columnar based databases.
Option D is invalid since this is normally used for object-level storage.
For more information on the differences, please refer to the below link-
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/SQLtoNoSQL.html