Final answer:
Operators of facilities producing manufactured meats are required to keep records for at least 120 days, as per regulatory requirements for traceability and accountability.
Step-by-step explanation:
According to regulatory requirements, especially those guided by entities such as the USDA's Food Safety and Inspection Service in the United States, most facilities involved in the production of manufactured meats are required to keep records relating to processing, handling, and sourcing for a certain period. This is important for traceability and accountability in the event that there are food safety concerns or a recall is necessary. In this case, the correct answer is D. 120 days. Meat processing facilities should maintain their records for at least 120 days to ensure that they are compliant with these regulations. These records should include information about the ingredients, processing steps, and any testing that has been done on the products.