配置路由器默認(rèn)路由的命令是( )。 
A.iproute220.117.15.0255.255.255.00.0.0.0 
B.iproute220.117.15.0255.255.255.0220.117.15.1 
C.iproute0.0.0.0255.255.255.0220.117.15.1 
D.iproute0.0.0.00.0.0.0220.117.15.
											
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