D1, D2, Tango, Phobos, Std, Runtime

[Paul]

I was reading a wiki about D and it talked about Tango vs. 
Phobos.  I read some items on runtime vs. standard libraries as 
well.  I am bit confused about all of it.  Are the standard 
libraries compiled into every exe and then the runtimes linked as 
needed?  Are they all or nothing entities?  In other words if I 
need a function to I have to include the whole library in my exe? 
  Is Tango the latest and Phobos the original?  Which should a new 
programmer start with?  Appreciate your patience(s).