You are riding as a group of three motorcyclists on a single-lane road. Which of the following is the safest and most appropriate formation?

1. A side-by-side formation to allow other vehicles to pass the group easily.
2. A single-file line, maintaining a two-second following distance between each motorcycle.
3. A staggered formation, using the left and right portions of the lane.
4. The leader in the center, with the other two riders on the far left and right edges of the lane.