Best and Do follow Article sites always have some rules and regulations regarding Article marketing-
1) There must be About the Author
2) Different site links must be only in About the Author
3) Must be used as Anchor text

Benefits of About the author -
1) Most of sites allowed About the author and these are always do follow links
2) links in body is not do follow and which is not consider by search engines

I always prefer only 2 links in about the author which is always best.

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