Please choose the correct answer to the question: Which best describes a characteristic of the jet stream?

Answer1: It forms a boundary between a cold air mass and a warm air mass. Answer2: It creates the high winds around the eye of a hurricane. Answer3: It forces the hot air along the equator to rise to areas in North America. Answer4: It causes high pressure air masses to rotate clockwise.

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