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2. The following is true about Kerberos single sign-on (Kerberos 5 SSO):
a) It's only supported in UNIX environments
b) It provides encrypted authentication
c) It works in all Windows platforms
d) It's an SAP add-on available as of Web AS 6.10
Kerberos is available in UNIX and Windows platforms. However, it only works with Windows 2000 and Windows Server 2003 Active Domain Controllers. Windows NT is not suitable for Kerberos 5. It provides encryption, which makes it a better option than regular Secure Single Sign-On. Kerberos SSO has been available since R/3 3.1x.