Which operation will fail if the DNS configuration is incorrect?

A.
domainname

B.
ping localhost.

C.
ping 192.168.1.1

D.
ping 23.45.82.174

E.
ping www.oracle.com.

F.
cat /etc/resolv.conf

Explanation:
www.oracle.com would have to be resolved to an IP name by the domain name service.