Question: a large collection of servers is called a(n)
[{'answer': 'server farm or server cluster'}, {'provenance': [{'wikipedia_id': '42116', 'title': 'Server (computing)', 'start_paragraph_id': 21, 'start_character': 0, 'end_paragraph_id': 21, 'end_character': 344, 'bleu_score': 0.963949056609222, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 6281376377893403173}, 'section': 'Section::::Hardware.:Clusters.\n'}]}]