getinfo circuit-status

[Nico Weinreich]

Hi,

when interacting with tor control I can get the circuit with command 
"getinfo circuit-status". What's a bit confusing for me, there are more 
than one circuits:

getinfo circuit-status
250+circuit-status=
51 BUILT rueckgrat,myrnaloy,$2DDAC53D4E7A556483ACE6859A57A63849F2C4F6 
PURPOSE=GENERAL
50 BUILT Freedom,nixnix,$4744AD962D32A11CD7CF4513617FAC33B339806B 
PURPOSE=GENERAL
15 BUILT HW2,$4F0826FA4C325C3CAA0054A6E023E566302C20C7,RainCloud 
PURPOSE=GENERAL
14 BUILT Freedom,SuperDave,bp1 PURPOSE=GENERAL

So I have two questions:

-which circuit does tor use (is it alway the circuit with the highest 
number?)
-is there a way to get this nodes always as fingerprint (for example, 
there are many nodes with name "idideditheconfig" and how do I know 
which one is it when the node is listed in plain text?)
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