Which of the following is NOT one of the 8 grades of beef?

The grade that is considered NOT one of the established categories for beef is "Deluxe." The USDA (United States Department of Agriculture) classifies beef into specific grades based on factors such as marbling, maturity, and meat quality. The recognized grades include Prime, which is of the highest quality and has abundant marbling, Select and Standard, which are lower in quality and marbling compared to Prime. These grading standards are important as they help consumers and retailers understand the quality and expected taste of the beef, as well as aid producers in marketing their products.

"Deluxe," however, does not exist within the USDA's official beef grading system and thus does not serve as a recognized classification for beef quality, distinguishing it clearly from the grades that do exist.