A bus is carrying 90 pounds of one allowed hazardous-material class and 450 pounds total of allowed hazardous materials. A shipper wants to add 20 pounds more of that same class. What is the correct decision?

1. Do not accept it because it would exceed the 100-pound limit for one class
2. Accept it because the total would stay below 500 pounds
3. Accept it if it is placed in the passenger area
4. Accept it if no hazard label is visible