The correct option is A section in a repository for collaborative project documentation.

GitHub Wikis provide a dedicated space within each repository where collaborators can write and organize documentation that lives alongside the code. They support multiple pages and version history and they are well suited for guides, architecture notes, onboarding instructions, and other living documents that evolve with the project.

The official GitHub help website refers to GitHub Docs, which is the product documentation site maintained by GitHub. That site explains how to use GitHub features while a repository wiki is where a project team documents its own project.

A feature intended for hosting and sharing code snippets describes GitHub Gists rather than repository wikis. Gists are optimized for sharing small pieces of code or text and they are not a full project documentation space.

Google Cloud Source Repositories is a separate Google service that hosted Git repositories and it is unrelated to GitHub Wikis. It has been retired which makes it even less relevant for current questions.

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