How can you ensure that you're not driving in someone's blind spot?

• If you can’t see the driver’s face in his or her side-view mirror
• If you can see the driver’s face in his or her side-view mirror
  Explanation:

  "Remember that, if you can’t see the driver’s face in his or her side-view mirror, the driver probably can’t see you."
• If you can’t see the driver’s face in his or her rear-view mirror
• None of the above