Why should you switch to low beams when you come to a curve or hilltop?

• To be able to see oncoming vehicles
• To avoid blinding oncoming drivers
• Both A & B
  Explanation:

  "On country roads, switch to low beams when you come to a curve or hilltop so you can see oncoming headlights and not blind oncoming drivers. If you can't see any headlights, switch back to high beams."
• To reduce your stopping distance