The correct option is They are used to publish extended documentation such as how to install, use, and architect the project.

This aligns with how GitHub Wikis are designed. A wiki gives the team a dedicated space for long form documentation that can span multiple pages and include setup steps, tutorials, architectural notes, and project principles. It complements the README, which is best kept concise for an overview and quick start, while the wiki holds the in depth guides that evolve over time.

They provide a private area that only repository owners can view is incorrect because wiki visibility follows the repository visibility. Public repositories have public wikis when enabled and private repositories restrict wiki access to collaborators rather than only owners.

Cloud Run is incorrect because it is a Google Cloud service for running containers and is unrelated to GitHub Wikis or repository documentation.

They host the main summary of the repository on the landing page is incorrect because that describes the README. The landing page summary comes from the README, not the wiki.

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