Please choose the correct answer to the question: A student is writing a report on volcanoes. What should the student include to best help explain how a volcano works?

Answer1: a photograph of an active volcano Answer2: a map showing the location of a volcano Answer3: a table of famous volcanoes and last known eruptions Answer4: a diagram showing the structure of a volcano

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