code: def _is_deprecated(key: str) -> bool:
      """Returns True if the given option has been deprecated"""
      key = key.lower()
      return key in _deprecated_options
  
imports: from __future__ import annotations
  from contextlib import ContextDecorator, contextmanager
  import re
  from typing import TYPE_CHECKING, Any, Callable, Generic, NamedTuple, cast
  import warnings
  from pandas._typing import F, T
  from pandas.util._exceptions import find_stack_level
label_desc: Use image node_id 11 for calling a global function with example usage: _is_deprecated(key) and returns: unknown