No Follow and Opening Link in new Window Attribute

All blog readers will need below info which helps one to make a link do follow or make it open the link in a new window
Below Link opens in new window and is a no follow link 
<a href= target="_blank"rel="nofollow"></a>
Below link makes a link no follow but opens in same window 
<a href= rel="nofollow"></a>
Below link makes a link open in a new window but is a do follow link
<a href= target="_blank"></a>