Final answer:
When seated behind the wheel, a driver should keep both hands on the steering wheel, adjust the seat and mirrors, and fasten the seatbelt, which encompasses all of the listed options.
Step-by-step explanation:
When properly seated behind the wheel of a vehicle, the driver should do all of the above:
- Keep both hands on the steering wheel to maintain control of the vehicle.
- Adjust the seat and mirrors for proper posture and visibility, ensuring they can see the road and use the vehicle's controls effectively.
- Fasten the seatbelt to secure themselves in case of an accident or sudden stop.
It should be noted, however, that the reference information provided regarding cell phones and radiation, such as using hands-free devices, keeping the phone away from the body, and not using a cell phone a car without an external antenna, while related to health and safety, does not directly pertain to the actions a driver should take when properly seated in a vehicle. Instead, those points are more related to safe cellphone practices to decrease potential radiation exposure.