The correct option is GitHub uses the action metadata to automatically fill the Marketplace listing with its title description branding and input and output details.

GitHub reads the action metadata file in the repository and uses fields such as name and description to populate the listing title and summary. The branding section controls the icon and color that appear on the Marketplace card and page. Inputs and outputs defined in the metadata are rendered automatically on the listing and the repository README is shown for detailed usage and examples.

The option GitHub converts the action metadata into a dedicated standalone page outside the repository is incorrect because the listing is a Marketplace page that is tied to the repository and it is not converted into a separate site outside GitHub.

The option GitHub auto generates a comprehensive usage guide from the metadata and replaces the repository README on the listing is incorrect because the README remains the primary usage guide and the metadata only supplements the listing with structured details.

The option GitHub relies on the metadata only to organize actions into categories and language filters is incorrect because metadata is used to populate the visible listing content such as title description branding and inputs and outputs and it is not limited to categorization or filtering.

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