<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _is_gs_folder(cls, result):
 """Return ``True`` if GS standalone folder object. GS will create a 0 byte ``<FOLDER NAME>_$folder$`` key as a pseudo-directory place holder if there are no files present. """

        return (cls.is_key(result) and
                result.size == 0 and
                result.name.endswith(cls._gs_folder_suffix))