The correct answer is D, AWS software development kits (SDKs). AWS SDKs provide developers with the necessary tools and libraries to interact with AWS services programmatically. They are available for various programming languages, such as Python, Java, .NET, Ruby, and more. SDKs offer APIs and helper functions that simplify the integration and interaction with AWS services. Using the AWS SDKs, developers can write code to authenticate with AWS, make API calls, manage resources, and deploy and configure AWS services. This enables programmatically automating tasks, provisioning resources, managing infrastructure, and interacting with AWS services without the need for manual intervention. Options A, B, and C are incorrect because the AWS Management Console is a web-based GUI, AWS Cloud9 is an IDE, and AWS CodePipeline is a CI/CD service, none of which allow for programmatic deployment and connection to AWS services like the SDKs do.