What type of fire extinguisher on a vessel with permanently installed fuel tank a b c d?

For a vessel with a permanently installed fuel tank, a Class B fire extinguisher is most appropriate, as it is designed to combat flammable liquid fires, including fuels. However, having a Class A extinguisher can also be beneficial for fires involving solid materials. Additionally, a Class C extinguisher is necessary if there are electrical components on board. It's important to ensure that the fire extinguishers are easily accessible and regularly maintained.