In def route(path, /, version, *parts, strict=True, **metadata), which classification is …

In def route(path, /, version, *parts, strict=True, **metadata), which classification is correct?

1. path is positional-only; version is positional-or-keyword; parts is variadic positional; strict is keyword-only; metadata is variadic keyword.
2. path and version are positional-only; strict is collected in metadata.
3. parts collects every argument after version, including strict.
4. metadata may also collect surplus positional arguments.