Q: Which of the following is the best description of the operation of split horizon?

• 1
  Information about a route should not be sent back in the direction from which the original update came
• 2
  It splits the traffic when you have a large bus (horizon) physical network
• 3
  It holds the regular updates from broadcasting to a downed link
• 4
  It prevents regular update messages from reinstating a route that has gone down