A technician is attempting to join a Windows XP Professional computer to a domain, but gets an error message that a domain controller cannot be contacted. Upon further testing, the technician is able to PING the domain controller by IP address. Which of the following is the MOST likely problem?

A.
An improper DNS configuration

B.
The user logged in does not have authority to join a domain

C.
An incorrect subnet mask

D.
A bad network card