When should you tap your horns lightly to communicate with other road users?

• When pedestrians or bicyclists appear to be moving into your lane of travel.
• When passing a driver who starts to turn into your lane.
• When a driver is not paying attention or may have trouble seeing you.
• All of the above.
  Explanation:

  "Tap your horn lightly to communicate to others when: 1. Pedestrians or bicyclists appear to be moving into your lane of travel. 2. Passing a driver who starts to turn into your lane. 3. A driver is not paying attention or may have trouble seeing you."