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

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.