Which of the following statements is TRUE?

A.
Windows 2000 uses Lightweight Directory Access Protocol (LDAP) for resource access and authentication.

B.
Mac OS X uses Active Directory which allows users to authenticate to a central database.

C.
UNIX is the only network operating system that has been certified by the National Security Agency (NSA) as C2 Red Book secure.

D.
Novell NetWare uses primarily Internet standard protocols, such as TCP/IP, FTP, HTTP, and LPR.