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When should a UHT (ultra high temp) packaged product be held under strict cold temperature control?

  1. Before the expiration date

  2. After opening

  3. When exposed to sunlight

  4. During transportation

The correct answer is: After opening

When a UHT packaged product is held under strict cold temperature control, it means that the product needs to be stored in a refrigerated environment to maintain its freshness. While all the options seem plausible, the only option that specifically mentions "after opening" is option B. This is because once a container of UHT packaged product is opened, it is exposed to air and other contaminants, which can lead to spoilage and bacterial growth unless it is kept refrigerated. The other options, such as A, C, and D, do not directly address the issue of how long a UHT packaged product can last without spoiling after it has been opened. Therefore, option B is the most appropriate and accurate answer.