Explanation

Microwave ovens cook food using microwave radiation, which excites water molecules in the food and generates heat. Infrared radiation is also used for cooking, for example in electric grills, toasters and broilers that brown and roast food. Both radiations therefore find use in cooking appliances. It is not true that all electromagnetic radiations are used — X-rays or gamma rays are not used for cooking. Hence infrared and microwave radiations is the correct answer.