Q58Single correct1 Mark20 Nov 2022Let `dict` be a dictionary. Which of the following is not a valid value of `dict`?Adict = {'a': {'a': 5, 'b': 4}, 'b': {'a': 2}}Bdict = {'a': {'a': 'b', 'b': 'b'}, 'b': {'a': 2}}Cdict = {'a': {'a': 5, 'a': 4}, 'b': {'a': 2}}Ddict = {'a': {'a': 5, 'b': 4}, 'b': {'b': 2}}