B. Resource elasticity
"Most people, when thinking of cloud computing, think of the ease with which they can procure resources when needed. This is only one aspect to elasticity. The other aspect is to contract when they no longer need resources. Scale out and scale in. Scale up and scale down. Some services do this as part of their service: Amazon S3, Amazon SQS, Amazon SNS, Amazon SES, Amazon Aurora, etc. Some require vertical scaling, like Amazon RDS. Others integrate with AWS Auto Scaling, like Amazon EC2, Amazon ECS, AWS Fargate, Amazon EKS, and Amazon DynamoDB. Amazon Aurora Serverless and Amazon Athena also qualify as elastic."
https://wa.aws.amazon.com/wellarchitected/2020-07-02T19-33-23/wat.concept.elasticity.en.html
B. Resource elasticity is an AWS value proposition that describes a user's ability to scale infrastructure based on demand.
Resource elasticity refers to the ability of a system or application to automatically scale resources up or down based on demand. This means that users can quickly add or remove computing resources to match their workload, and pay only for what they use. Resource elasticity is a key advantage of using cloud infrastructure, and is a fundamental aspect of the AWS platform.
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