What should you reply?

You work as an enterprise administrator at Domain.com. The Domain.com network consists of a single Active Directory domain named Domain.com. All servers on the Domain.com network run Windows Server 2008.
A newly appointed inexperienced enterprise administrator wants to know which of the following Active Directory Service will provide Internet-based clients a secure identity access solution that will be able to operates on both Windows and non-Windows operating systems.
What should you reply?

A.
You should tell the newly appointed inexperienced enterprise administrator that the Active Directory Rights Management Service (AD RMS) offers Internet-based clients a secure identity access solution which operates on both Windows and non-Windows operating systems.

B.
You should tell the newly appointed inexperienced enterprise administrator that the Active Directory Lightweight Directory Service (AD LDS) offers Internet-based clients a secure identity access solution which operates on both Windows and non-Windows operating systems.

C.
You should tell the newly appointed inexperienced enterprise administrator that the Active Directory Domain Services (AD DS) offers Internet-based clients a secure identity access solution which operates on both Windows and non-Windows operating systems.

D.
You should tell the newly appointed inexperienced enterprise administrator that the Active Directory Federation Services (AD FS) offers Internet-based clients a secure identity access solution which operates on both Windows and non-Windows operating systems.

Explanation:
98
Active Directory Federation Services (AD FS) supplies Internet-based clients with a secure identity access solution which operates on both Windows and non-Windows operating systems. AD FS also offers users the power to do a single sign-on (SSO) as well as access applications on other networks devoid of requiring a secondary password.