Final answer:
The USDA grade of beef typically not purchased for general foodservice is 'Commercial', as it is a lower quality compared to Choice or Select and is often used in processed foods rather than restaurants.
Step-by-step explanation:
The USDA grade of beef not typically purchased for general foodservice use is D. Commercial. The USDA beef grading system classifies beef based on quality and marbling which impacts flavor, tenderness, and juiciness. The highest grade is Prime, which is often found in steakhouses and upscale markets. The next is Choice, which is still of high quality and is widely used in foodservice. Select is leaner than Choice and is also commonly used in various foodservice settings. However, the grades such as Standard and Commercial are lower quality and are less likely to be used in restaurants; these grades are often used in processed foods or other products where the quality of beef is not the primary concern.