What is the purpose of an interior rearview mirror?

• To see passengers in the rear seats
• To see directly behind the car through the rear window
  Explanation:

  "To reduce the blind spots, position the interior mirror so that the center of the mirror shows the center of the rear window. You should be able to see directly behind the car when the interior mirror is properly adjusted."
• To see the right and left sides of the car
• None of the above