Which service should you install?

You are an enterprise administrator for Domain.com. The company runs Windows Server 2008 on all the servers on the network. A new security policy states that all documents and e-mails using Microsoft Office 2007 Enterprise needs to be secure. You need to install a service to accomplish this set requirement. Which service should you install?

A.
The best option is to install the Active Directory Lightweight Directory Services (AD LDS).

B.
The best option is to install the Active Directory Federation Services (AD FS).

C.
The best option is to install Active Directory Rights Management Service (AD RMS).

D.
The best option is to install Active Directory Certificate Services (AD CS).

Explanation:
The Active Directory Rights Management Services will allow you to ascertain which access the users and administrators should have. You can also use this to secure email messages, internal websites, as well as documents.
Incorrect Answers:
A: You should not use the AD LDS. It enabled applications to store and retrieve information without needing the dependencies AD DS requires.
B: You should not use the AD FS. This has the ability to do a single sign-on as well as accessing other networks without requiring a secondary password.