Final answer:
The correct answer is option 4) Class K.The correct extinguisher for putting out a vegetable oil fire in a deep fat fryer is the Class K fire extinguisher, which is required for use in restaurant kitchens.
Step-by-step explanation:
Class K fire extinguishers are specifically designed for cooking fires involving combustible cooking media such as oils and fats. This type of fire extinguisher uses a special wet chemical solution that is able to cool the fire and prevent re-ignition by creating a barrier between the oxygen and the fuel source.
They are typically found in commercial kitchens, such as those in restaurants, cafeterias, and other food service facilities, due to their effectiveness against grease and oil fires.
Class K fire extinguishers are a requirement in all applicable restaurant kitchens due to the high incidence of grease fires in these environments. It is crucial for safety that anyone working in a kitchen knows how to properly use this type of extinguisher in the event of a fire.