Which service allows for automated scalable deployment of applications?

AWS Elastic Beanstalk is the service that facilitates the automated and scalable deployment of applications. It is designed to automate the provisioning of infrastructure while still allowing developers to retain full control of the underlying resources. When you deploy an application, Elastic Beanstalk automatically handles the deployment details such as capacity provisioning, load balancing, scaling, and application health monitoring.

One of the key elements of Elastic Beanstalk is its ability to seamlessly scale applications according to demand. This means that as application load increases, Elastic Beanstalk can automatically allocate additional resources, thereby ensuring availability and performance without manual intervention. Additionally, developers can easily manage their application environments through a simple user interface, command line interface, or API.

While AWS Auto Scaling is focused on scaling AWS resources dynamically, it doesn't directly handle application deployment itself. AWS CloudFormation is a service for creating and managing a collection of related AWS resources with templates, but it does not automate the full application deployment process. AWS CodeDeploy is used for deploying applications to various compute services, but it requires further configuration and does not automatically manage application environments like Elastic Beanstalk does.

Therefore, AWS Elastic Beanstalk stands out as the optimal choice for automated, scalable deployment of applications.