Please choose the correct answer to the question: A student blew air into a beach ball and sealed it. She then pushed on the middle of the beach ball. What happened to the air inside the beach ball?

Answer1: The air in the beach ball escaped. Answer2: The air in the beach ball became a liquid. Answer3: The type of air in the beach ball changed. Answer4: The shape of the air in the beach ball changed.

Answer format: answer1/answer2/answer3/answer4