A concrete mixing machine weighing 800 pounds needs to be loaded with rocks and sand. Trucks carrying 120 pounds of sand and 30 pounds of rocks will be used to load the machine. In order for the machine to function properly, the combined weight of the machine and the mixing load cannot exceed 2,800 pounds. Which inequality describes the restriction on truck loads, x, to ensure the mixing machine functions properly? A. 150x + 800 ≤ 2,800 B. 150x + 800 ≥ 2,800 C. 800x + 150 ≤ 2,800 D. 120x + 800 ≤ 2,800