The correct answer is: None of the above options are correct requirements, but by process of elimination, the only requirement that aligns with the Nutritional Labeling Act of 1990 and its revisions is **none**. However, if you are looking for the one that is least incorrect, the answer would be that **allergens must be included** (meaning option b is wrong because exclusion is not allowed). **Explanation:** The Nutritional Labeling and Education Act (NLEA) of 1990 requires that nutrition labeling is consistent, clear, and standardized. One requirement is the use of standardized serving sizes (eliminating option a) to allow consumers to compare products easily. Allergens must be clearly listed on labels for consumer safety, so exclusion of allergens (option b) is not allowed under current regulations. Manufacturer contact information is required, so stating it is optional (option c) is incorrect. Lastly, only health claims that are supported by scientific evidence and approved by the FDA are permitted, so inclusion of scientifically unsupported claims (option d) is not allowed. Thus, none of the options given accurately reflect a requirement of the Nutritional Labeling Act; in fact, all are prohibited or required in the opposite manner.