Question: 4. what does c stand for in case of disk scheduling algorithms
[{'answer': 'Circular Elevator Algorithm', 'provenance': [{'wikipedia_id': '1206990', 'title': 'Elevator algorithm', 'start_paragraph_id': 7, 'start_character': 276, 'end_paragraph_id': 7, 'end_character': 303, 'bleu_score': 1.0, 'section': 'Section::::Variations.\n'}]}, {'provenance': [{'wikipedia_id': '1206990', 'title': 'Elevator algorithm', 'start_paragraph_id': 7, 'start_character': 0, 'end_paragraph_id': 7, 'end_character': 657, 'bleu_score': 0.9826823455989031, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 18439213344365283249}, 'section': 'Section::::Variations.\n'}]}]