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 go off the road rather than in traffic if the brakes become disengaged
  Explanation:

  "When parking facing uphill on a road without a curb, you should turn your steering wheel sharply to the right. This way, if your vehicle begins to roll, it will move off the road and not into traffic, preventing a potential hazard. Turning the wheels in this manner helps avoid the vehicle rolling into the path of other vehicles."
• Setting the wheels towards the curb prevents the vehicle from rolling backward
• To lock the steering you should set the steering wheels towards the right
• None of these