Please choose the correct answer to the question: A student poured water into a plastic tray. The student then put the tray into the freezer. What property of the water changed as the water froze?

Answer1: The water became a gas. Answer2: The mass of water increased. Answer3: The water took a definite shape. Answer4: The flavor of the water changed.

Answer format: answer1/answer2/answer3/answer4