Answer: 4. Launch from Earth, carrying astronauts that perform research.
Step-by-step explanation:
A rover is a vehicle which is used for the purpose of space exploration. It is required to be launch from the earth. It helps to move across the entire surface of the planet or any other celestial body. It is designed in such a way to transport the human spaceflight crew members so that they can observe the planet directly. These can land on the celestial body, they can collect the information and may also take the samples from the celestial body. The rovers can collect rocks, dust and can take photographs in space. Hence, they are useful in finding about the facts of the universe and will help in research.