Question: what authentication scheme is being used with radius
[{'answer': 'PAP', 'provenance': [{'wikipedia_id': '191866', 'title': 'RADIUS', 'start_paragraph_id': 11, 'start_character': 94, 'end_paragraph_id': 11, 'end_character': 97, 'bleu_score': 1.0, 'section': 'Section::::Protocol components.:Authentication and authorization.\n'}]}, {'answer': 'CHAP', 'provenance': [{'wikipedia_id': '191866', 'title': 'RADIUS', 'start_paragraph_id': 11, 'start_character': 99, 'end_paragraph_id': 11, 'end_character': 103, 'bleu_score': 1.0, 'section': 'Section::::Protocol components.:Authentication and authorization.\n'}]}, {'answer': 'EAP', 'provenance': [{'wikipedia_id': '191866', 'title': 'RADIUS', 'start_paragraph_id': 11, 'start_character': 107, 'end_paragraph_id': 11, 'end_character': 110, 'bleu_score': 1.0, 'section': 'Section::::Protocol components.:Authentication and authorization.\n'}]}, {'provenance': [{'wikipedia_id': '191866', 'title': 'RADIUS', 'start_paragraph_id': 11, 'start_character': 0, 'end_paragraph_id': 11, 'end_character': 605, 'bleu_score': 0.9788329837059241, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 15786313473065302259}, 'section': 'Section::::Protocol components.:Authentication and authorization.\n'}]}]