Your company has a single Active Directory directory service domain. The company uses a public certification authority (CA). Several stand-alone servers that run Windows Server 2003 reside on a dedicated network segment. The stand-alone servers do not have access to the Internet. You need to specify the IPSec authentication method to use for the stand-alone servers. Which method should you use?

A.
preshared key

B.
CHAP authentication

C.
Kerberos authentication

D.
IKE authentication security