Different methods of extinguishing a fire involve the following : I. Removing the combustible substance. II. Cooling the substance to a temperature below its ignition temperature. III. Cutting off the supply of air. Which of the following statements is correct?

• A.  Method I is suitable in case of a building on fire.
• B.  Method II involves water which works when wood or paper are on fire.
• C.  Method III involves carbon dioxide gas which is lighter than oxygen and forms a blanket around the air.
• D.  All of these