A shipment contains 600 pounds of a Table 2 flammable liquid and 500 pounds of a Table 2 corrosive, with no exceptions. What placarding issue should the driver consider?

1. The aggregate Table 2 weight is 1,100 pounds, so placarding is generally required
2. Neither material counts because each is under 1,001 pounds alone
3. Only the corrosive counts toward placarding
4. Placarding is never based on aggregate gross weight