Answer – B
This is mentioned in the AWS Documentation.
Amazon Redshift is a fully managed, petabyte-scale data warehouse service in the cloud. You can start with just a few hundred gigabytes of data and scale to a petabyte or more. This enables you to use your data to acquire new insights for your business and customers.
Option A is invalid since this is a fully managed NoSQL database.
Option C is invalid since this is an object data store.
Option D is invalid since this is a MySQL or PostgreSQL data store.
For more information on AWS Redshift, please visit the following URL-
https://docs.aws.amazon.com/redshift/latest/mgmt/welcome.html