Please choose the correct answer to the question: Students study human body structure to learn how the body functions. Which life-size model would best represent the size, shape, and location of human internal organs?

Answer1: a two-dimensional upper body diagram with magnetic stickers of the organs Answer2: a three-dimensional plastic upper body with removable parts Answer3: a two-dimensional detailed wall poster Answer4: a three-dimensional paper body

Answer format: answer1/answer2/answer3/answer4