e) link to it from the footer of your index page only. It does serve a purpose but doesn't need to receive sitewide link status. Don't worry about nofollow or robots.txt, it will never rank in search anyway and blocking it cuts of rank flow, not something you want.
As for Google, they simply CANNOT and WILL NOT EVER tell webmasters exactly what to do because their concern is to differentiate between quality of pages. If every webmaster was to receive too much information from Google the task of ranking would become that much harder.
Note: I recently pulled up a list of top 50 sites for specific keywords that is 4 years old and was astonished to see that 49 of the sites are still there and almost all of them are in or very near to their original rankings still. Google serps do not change very much despite a feeling they do. Don't expect ANYTHING you do to your site today to result in a spike in traffic, nothing short of mention on a bigger site will give you that.