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Final answer:The practice of not reassigning previously used identifiers for at least one year helps prevent security and privacy issues in IT systems, especially those with tiered services or usage limits.Explanation:The policy mentioned in the question relates to the management of identifiers within an IT system or service, ensuring that identifiers like user IDs or device IDs that have been previously assigned are not reused for a different entity for at least one year. This practice is mainly implemented to prevent security and privacy issues that could arise from the reuse of identifiers. It is particularly important for systems that need to keep track of how much each user is using, especially if they have tiered services with free and pay options or they need to enforce usage limits to prevent abuse....