A user contacts the help desk after being unable to log in to a corporate website. The user can log
into the site from another computer in the next office, but not from the PC. The user’s PC was able
to connect earlier in the day. The help desk has user restart the NTP service. Afterwards the user
is able to log into the website. The MOST likely reason for the initial failure was that the website
was configured to use which of the following authentication mechanisms?

A.
Secure LDAP

B.
RADIUS

C.
NTLMv2

D.
Kerberos