code: def opt_manager():
      ret = OptionManager(
          version="123",
          plugin_versions="",
          parents=[],
          formatter_names=[],
      )
      register_default_options(ret)
      return ret
  
imports: from __future__ import annotations
  import configparser
  import os.path
  from unittest import mock
  import pytest
  from flake8 import exceptions
  from flake8.main.options import register_default_options
  from flake8.options import config
  from flake8.options.manager import OptionManager
label_desc: Use image node_id 18 for calling a global function with example usage: opt_manager() and returns: ret