Question about recursion queries

[Zhang Meng]

The question is given that

When I ask the bind server, what's the A record of google.com?

for the ROOT name server, there're several NS record

*.** **60493** **IN** **NS** **g.root-servers.net.*
*.** **60493** **IN** **NS** **b.root-servers.net.*
*.** **60493** **IN** **NS** **m.root-servers.net.*
*.** **60493** **IN** **NS** **d.root-servers.net.*
*.** **60493** **IN** **NS** **j.root-servers.net.*
*.** **60493** **IN** **NS** **c.root-servers.net.*
*.** **60493** **IN** **NS** **i.root-servers.net.*
*.** **60493** **IN** **NS** **a.root-servers.net.*
*.** **60493** **IN** **NS** **h.root-servers.net.*
*.** **60493** **IN** **NS** **k.root-servers.net.*
*.** **60493** **IN** **NS** **l.root-servers.net.*
*.** **60493** **IN** **NS** **f.root-servers.net.*
*.** **60493** **IN** **NS** **e.root-servers.net.*

How does the bind handle these multiple NS records?

A).Select one of them to ask the NS records for com. ? If fails, try the
second one?
B).Or send several queries concurrently, and get the first one responsed?


Could you show me the related code in Bind9.7.1-P2?

-- 
Yours sincerely
ZhangMeng
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