The correct answer is B, AWS CloudFormation. AWS CloudFormation allows you to use templates to define and deploy your infrastructure as code, making it reliable and repeatable. It enables you to create, update, and delete a collection of related AWS resources, ensuring consistency and reducing human errors. The other options are not the best fit for the given requirements: A (AWS Lambda) is a serverless compute service, C (AWS Fargate) is a compute engine for containers, and D (AWS CodeDeploy) is a deployment service for code.