Please choose the correct answer to the question: Tungsten is a metal which is found in large amounts in filaments, which are used in incandescent light bulbs. These light bulbs work because

Answer1: light bulbs get very warm Answer2: filaments are able to freeze Answer3: the filament glows warmly Answer4: the filament catches fire

Answer format: answer1/answer2/answer3/answer4
Answer: answer3