On a system wide basis， which of the following procedures is best to make NIS name resolution take precedence over DNS？（）

A、Remove the /etc/resolv.conf file

B、Unset the NSORDER environment variable

C、Add the following line to /etc/netsvc.conf： hosts=nis，bind，local

D、In a NIS and DNS environment， NIS takes precedence so there is nothing to change

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