A DNS server is correctly configured to resolve queries. On a system on the
network, you run the command, ping www.sun.com, and immediately receive the error message:

ping: unknown host www.sun.com

What are two possible causes of this problem? (Choose two.)

A.
The nscd daemon is NOT running on the system.

B.
The DNS server is not a secondary server for sun.com.

C.
The www.sun.com host does not reply to ping requests.

D.
The file, /etc/nsswitch.conf, does NOT reference DNS.

E.
The file, /etc/dns.conf, has NOT been configured on the system.

F.
The file, /etc/resolv.conf, has NOT been configured on the system.