How long must Shellstock ID tags be kept on file?

The correct answer pertains to the requirement that shellstock identification tags must be kept on file for a specific period after the food has been served to ensure traceability and safety. Keeping these tags for 90 days from the time they were served allows food businesses to maintain records that can be crucial in the event of a foodborne illness outbreak. This duration aligns with regulatory guidelines that emphasize the necessity of knowing the source and handling of shellfish, which could pose significant health risks if contaminated. Retaining the tags enables food handlers to trace back to the origin of the shellfish if needed, thereby facilitating effective tracking and accountability in food safety practices.