You need to migrate your company's on-premises relational database to AWS to improve scalability and availability while controlling costs. The on-premises database is currently experiencing variable loads and would benefit from an AWS service that adjusts its compute capacity based on the incoming load and does not require heavy database administration overhead. Which database service should you choose to optimize for cost and manageability?
Amazon Redshift
Amazon RDS with Reserved Instances
Amazon Aurora Serverless
Amazon DynamoDB with auto-scaling enabled