At each initial and subsequent inspection for certification, all carbon dioxide fire extinguishers aboard a vessel are __________. (small passenger vessel regulations)

Correct Answer: Option C — weighed

46 CFR 181.300 requires that all carbon dioxide fire extinguishers be weighed at each inspection for certification. Weighing is the standard method to verify that the cylinder contains the required charge of CO2, ensuring the extinguisher remains fully operational and capable of suppressing fires as intended.