A developer has written code for an application and wants to share it with other developers on the team to receive feedback. The shared application code needs to be stored long-term with multiple vers

AWS CodeBuild is a continuous integration service that compiles and tests code; it does not provide source code storage, versioning, or change tracking capabilities.

Amazon S3 can store files long-term but lacks native version-control semantics such as commit history, branching, diffs, and batch change tracking that developers expect from a code-sharing workflow.

AWS CodeCommit is a fully managed Git repository service that supports multiple versions, commit history, branching, and batch change tracking through commits, making it purpose-built for collaborative code sharing with long-term retention.

AWS Cloud9 is a cloud-based integrated development environment for writing and debugging code; it is not a version control or code repository service.