You have an Exchange Server 2010 organization and an Active Directory Rights Management Services（AD RMS） server.  All users access their mailboxes by using Outlook Web App （OWA）.  You need to plan a security solution for the organization to meet the following requirements：.Secure messages by using administrator-defined templates  .Ensure that e-mail messages sent by users can be stored in an encrypted format  What should you include in the plan？（）

• A、a legal hold
• B、Domain Security
• C、Outlook Protection Rules
• D、Secure/Multipurpose Internet Mail Extensions （S/MIME）