Why should you set the steering wheel towards the curb when parking the vehicle facing uphill on a road without a curb?

• So that the vehicle will roll off the road rather than into traffic if the brakes fail.
  Explanation:

  "When parking a vehicle facing uphill on a road without a curb, you should turn the steering wheel towards the side of the road. This precaution ensures that if the brakes fail, the vehicle will roll off the road rather than into traffic."
• Turning the wheels toward the curb prevents the vehicle from rolling backward.
• To lock the steering, you should turn the wheels to the right.
• None of these.