The correct option is GitHub is a hosted platform built around Git that adds collaboration and code management capabilities.

This description is accurate because GitHub hosts Git repositories and provides collaboration features such as pull requests, issues, code review, permissions, project boards, and wikis. It also integrates automation and package management, which extends the core version control provided by Git with a complete platform for team workflows.

GitHub is primarily a continuous integration and delivery tool is incorrect because CI and CD are features offered through GitHub Actions while the service itself is a broader platform for hosting Git repositories and enabling collaboration.

GitHub is a distributed version control system is incorrect because Git is the distributed version control system while GitHub is the platform built on top of Git that provides hosting and collaboration features.

GitHub is a file sharing site that relies on centralized version control is incorrect because GitHub is not a simple file sharing site and it uses Git which is a distributed model rather than a centralized one.

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