A corporate environment includes client computers that run Windows 7 and Microsoft Outlook 2010. The client computers are joined to an Active Directory Domain Services (AD DS) domain. Email services are provided by a cloud-based Exchange Server 2010 SP1 service provider. You need to recommend a method for automatically protecting email messages that contain the phrase Top Secretin the subject line from being read by unauthorized users. In addition, you need to ensure that those messages are protected in the message sender s Sent Items folder.

What should you recommend?

A.
Use Secure/Multipurpose Internet Mail Extensions (S/MIME).

B.
Implement message classification and an associated transport rule.

C.
Use Active Directory Rights Management Services (AD RMS) and Outlook protection rules.

D.
Use Active Directory Rights Management Services (AD RMS) and Information Rights Management (IRM) transport rules.