Please choose the correct answer to the question: Which of the following describes how a microwave oven heats food?

Answer1: The oven's interior reflects heat onto the food. Answer2: The oven's interior, like a lens, focuses heat onto the food. Answer3: Water molecules in the food reflect energy from microwave radiation. Answer4: Water molecules in the food absorb the energy of microwave radiation.

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