An internal intranet site is required to authenticate users and restrict access to content to only those who are authorized to view it The site administrator previously encountered issues with credential spoofing when using the default NTLM setting and wants to move to a system that will be more resilient to replay attacks Which of the following should the administrator implement?
A . NTLMv2
B . TACACS+
C . Kerberos
D . Shibboleth
Answer: B