In which situations should you be prepared to brake unexpectedly?

• When driving next to parked cars
• When driving in a school zone or residential area
• When seeing the brake lights of other cars in a heavy, slow-moving traffic
• All of the above
  Explanation:

  "Drivers should be prepared to brake unexpectedly in the following situations: (a) When driving next to parked cars, (b)When driving in a school zone or residential area, (c)When seeing brake lights of other cars, (d) When driving in heavy, slow-moving traffic."