What is the safe way to give space to an emergency vehicle on a one-way roadway?

• Carefully and legally stop your vehicle in a safe location at the left edge of the roadway.
• Carefully and legally stop your vehicle in a safe location in the centre of the roadway.
• Carefully and legally stop your vehicle in a safe location at the nearest edge of the roadway.
  Explanation:

  "When an emergency vehicle approaches your vehicle on a two-way roadway, carefully and legally stop your vehicle in a safe location at the nearest edge of the roadway."
• Carefully and legally stop your vehicle anywhere you want to.