A mixed load includes 700 lb of Class 3 flammable liquid and 500 lb of Class 8 corrosive material, both Table 2 materials with no exception. What placarding issue should the driver recognize?

1. Only the heavier material can ever require a placard
2. Neither material counts because each class is under 1,001 lb
3. The aggregate gross weight is 1,001 lb or more, so Table 2 placarding may be required
4. Placards are required only if the two materials share one proper shipping name