How should a DNS client be configured？（）
- AEdit the /etc/netsvc.conf file to have a nameserver and a domain search order.
- BEdit the /etc/resolv.conf file to have a nameserver and a domain search order.
- CEdit the /etc/resolv.conf file to have a nameserver， domain， and domain search order.
- DEdit the /etc/netsvc.conf file to have a nameserver， domain， and domain search order.