def METHOD_NAME(resp_format: ResponseFormat) -> str:
    """
    Determine file extension for various response formats.
    CSV's and HTML reports are zipped together before uploading to s3.
    """
    if resp_format == ResponseFormat.csv:
        return "zip"
    if resp_format == ResponseFormat.json:
        return "json"
    if resp_format == ResponseFormat.html:
        return "zip"
    raise NotImplementedError(f"No extension defined for {resp_format}")