A load contains 600 lb of Class 3 flammable liquid and 500 lb of Class 8 corrosive, both Table 2 non-bulk materials with no exception. What placarding concept applies?

1. The 1,001 lb aggregate Table 2 threshold can require placarding
2. No placards because neither material alone exceeds 1,001 lb
3. Only Class 9 placards are allowed
4. Placards are needed only if crossing state lines