Question: what type of one-time password (otp) changes after a set time period
[{'answer': 'time - synchronized', 'provenance': [{'wikipedia_id': '1190077', 'title': 'One-time password', 'start_paragraph_id': 45, 'start_character': 339, 'end_paragraph_id': 45, 'end_character': 361, 'bleu_score': 1.0, 'section': 'Section::::Comparison of technologies.:OTPs versus other methods of securing data.\n'}]}, {'provenance': [{'wikipedia_id': '1190077', 'title': 'One-time password', 'start_paragraph_id': 12, 'start_character': 0, 'end_paragraph_id': 12, 'end_character': 865, 'bleu_score': 0.9865312178338931, 'meta': {'yes_no_answer': 'NONE', 'annotation_id': 9321006788366555131}, 'section': 'Section::::Methods of generating the OTP.:Time-synchronized.\n'}]}]