A mixed load contains several Table 2 hazard classes, each below 1,001 pounds, but the aggregate gross weight is 1,200 pounds. What is the placarding issue?

1. Placards are generally required because the Table 2 aggregate gross weight reaches 1,001 pounds or more
2. No placards are ever required unless one class alone reaches 1,001 pounds
3. Only Class 9 placards are required
4. Placards are forbidden for mixed loads