What does Argentine traffic law require regarding the use of vehicle hazard warning lights (balizas intermitentes)?

1. They must be turned on whenever a driver wants to park in a forbidden yellow-curb zone
2. They must be used to indicate an emergency detention, a complete breakdown, an immediate hazardous obstruction, or when executing a parking maneuver
3. They should be kept on continuously when driving in heavy rain on expressways
4. They should be used instead of headlights when driving at night