Which of these is the best backlink building technique for SEO these days?

Hello,
Which of these is the best backlink building technique for SEO these days? a. Forum submission b. Article submission c. Blog submission d. Social Bookmarking e. Directory submission f. Profile creation g. Blog posting

Guest Posting is most popular SEO Link-building techniques to grow your website backlinks. http://jaxroofingexperts.com/

The 6 Smart Ways

1. Guest posts
2. Public relations
3. Broken link building
4. Skyscraper content
5. Compile a resource
6. Find competitors’ backlinks and “steal” them

Your best links will come from genuine sources linking to your content but if you are going to source your own links as well I think quality articles on quality blogs is your best bet.