If a vehicle is equipped with a Compressed Natural Gas (GNC - Gas Natural Comprimido) system in Argentina, what documentation is required during vehicle inspection?

1. Only the standard engine oil change certificate
2. The official GNC yellow card (Cédula de GNC) and an unexpired annual ENARGAS inspection windshield sticker (Oblea de GNC)
3. A written authorization letter from the local fire department
4. An environmental emissions waiver issued by the municipal town hall