A company offers a business-to-business software service that runs on dedicated infrastructure deployed in each customer's AWS account. Before a…

This solution requires a continuous delivery pipeline that can deploy infrastructure across multiple AWS accounts and then run tests. AWS CodePipeline is the service designed to orchestrate such workflows. For deploying infrastructure defined in AWS CloudFormation templates to multiple accounts from a central location, AWS CloudFormation StackSets is the most efficient tool, minimizing administrative effort. After the infrastructure is provisioned, AWS CodeBuild provides a fully managed environment to compile code, run integration tests against the new infrastructure, and report the results, seamlessly integrating as a test action within CodePipeline. This combination directly addresses all requirements using the most appropriate services for each task.

A. Amazon CodeGuru is a code quality and security analysis service; it does not execute integration tests. AWS CodeDeploy is for application deployment, not infrastructure provisioning.
C. CloudFormation change sets are for previewing updates to a single stack, not for deploying across multiple accounts. StackSets is the correct tool for multi-account deployments.
D. AWS SAM is optimized for serverless applications, not for EC2 and RDS infrastructure. AWS CodeDeploy is not the primary service for running integration tests; CodeBuild is.

1. AWS CloudFormation User Guide: "AWS CloudFormation StackSets extends the functionality of stacks by enabling you to create, update, or delete stacks across multiple accounts and AWS Regions with a single operation." This supports the use of StackSets for multi-account deployment. (See the "Working with AWS CloudFormation StackSets" section).

2. AWS CodePipeline User Guide: The guide lists "AWS CloudFormation StackSets" as a valid deployment action provider, confirming its integration for multi-account deployments within a pipeline. (See the "AWS CodePipeline action structure reference" -> "Action reference for CloudFormationStackSet").

3. AWS CodeBuild User Guide: "AWS CodeBuild is a fully managed continuous integration service... CodeBuild compiles your source code, runs tests, and produces software packages that are ready to deploy." This confirms its role in running tests. (See the "What Is AWS CodeBuild?" section).

4. AWS CodePipeline User Guide: The guide details adding a test action to a pipeline, with AWS CodeBuild being a primary provider option. This demonstrates the intended architecture of using CodePipeline to orchestrate infrastructure deployment followed by a CodeBuild test stage. (See "Tutorial: Create a simple pipeline (S3 bucket)" which shows the standard Source -> Build -> Deploy/Test stages).