Which tool should a developer use to integrate AWS service features directly into an application?

Explanations:

The AWS Software Development Kit (SDK) provides libraries and tools to integrate AWS services directly into applications, allowing developers to build and manage applications that utilize AWS resources.

AWS CodeDeploy is a deployment service that automates software deployments to various compute services. While it is useful for deployment, it does not provide direct integration of AWS service features into applications.

AWS Lambda is a serverless compute service that allows you to run code in response to events. While it can be integrated into applications, it is not a tool for integrating AWS services directly; rather, it executes code based on triggers.

AWS Batch is a service for running batch computing workloads. It manages job scheduling and execution but does not serve as a direct integration tool for AWS services into applications.