Final answer:
Prime rib is graded USDA prime.
Step-by-step explanation:
The statement 'Prime rib is graded USDA prime' is True.
USDA (United States Department of Agriculture) has a grading system for beef, and prime rib is a cut of beef. USDA prime is the highest grade of beef, indicating that it has the highest level of marbling and tenderness.
Other grades include USDA choice and USDA select, with choice being of good quality and select being of average quality.