On a New York CDL tanker knowledge question about NY tank endorsement threshold, what is the safest or most accurate answer?

1. Only an interstate trip outside New York
2. A Class A or B CDL vehicle hauling liquid or liquid gas in tanks over 119 gallons each with 1,000 gallons or more aggregate rated capacity
3. Only a vehicle carrying hazardous liquid
4. Only a tank with more than 5,000 gallons in one compartment