Please choose the correct answer to the question: Stretching is considered an important step before engaging in sports. In an investigation to see whether stretching before physical exertion reduces sports injuries, who would the control group most likely be?

Answer1: athletes who stretch before working out Answer2: non-athletes who stretch before working out Answer3: athletes who do not stretch before working out Answer4: non-athletes who do not stretch before working out

Answer format: answer1/answer2/answer3/answer4