What does favicon.ico in a webserver’s log indicate?

Question: What does favicon.ico in a webserver’s log indicate?

1.In MSIE v.5, when a user adds a link to his bookmarks, or drags the link to his desktop, the browser attempts to retrieve an icon for the URL.

2.Web search engines frequently give higher ranking to sites that keep icons for their service on the front page.

3.The “favicon.ico” is a hacker trinket meant to mark servers on which a hacker has “got root” for his friends.

4.Somebody has probed the webserver looking for a mis-configured FrontPage implementation.

Answer:3