Where should pedestrians stop before stepping into the street for crossing?

• They should stop at the curb or the edge of the road if there is no curb.
  Explanation:

  "Pedestrians should stop at the curb or the edge of the road if there is no curb before stepping into the street fo crossing."
• They should stop at the edge of the center lane lines.
• They should stop 5 feet away from the edge of the curb.
• All of the above.