The benefit of option 2 over option 3 is that in the case where just enough countries have WMDs so that if anyone drops a WMD someone will respond but no other countries do you also minimize the number of surfaces for mistakes/abuses.
The benefit of option 2 over option 3 is that in the case where just enough countries have WMDs so that if anyone drops a WMD someone will respond but no other countries do you also minimize the number of surfaces for mistakes/abuses.