A load has 800 pounds of a Table 2 flammable liquid and 300 pounds of a different Table 2 corrosive. What is the key placarding issue?

1. The aggregate gross weight of Table 2 materials may reach the 1,001-pound threshold
2. Each material is under 1,001 pounds so placards are never allowed
3. The materials become unregulated because they are different classes
4. Only the heavier material counts