code: def list_audio_backends() -> List[str]:
      """List available backends
  
      Returns:
          list of str: The list of available backends.
  
          The possible values are; ``"ffmpeg"``, ``"sox"`` and ``"soundfile"``.
      """
  
      return list(utils.get_available_backends().keys())
  
imports: from typing import List, Optional
  from torchaudio._internal.module_utils import deprecated
  from .None import utils
  from .common import AudioMetaData
label_desc: Use image node_id 1 for calling a global function with example usage: list_audio_backends() and returns: list