Under Ordinance No. 40 Art. 8b, which duty applies to crew members when dangerous goods are being loaded?

1. They may wait in a café until loading is finished and then sign the CMR
2. They must be present at loading and must refuse packages that are damaged, unsealed, or missing the required hazard labels
3. They must open every drum to confirm the UN number by smell
4. They must transfer orange plates to the consignee's private car