You have an Exchange Server 2010 organization. Your company has a relationship with another company. The partner company has an Exchange Server 2010 organization.
You need to recommend a security solution to meet the following requirements:

* Ensure that all e-mail delivery between your servers and the partner company s servers is encrypted
* Ensure that all communication between your servers and the partner company s servers is authenticated

What should you include in the solution?

A.
Active Directory Rights Management Services (AD RMS)

B.
Domain Security

C.
Forms-based Authentication

D.
Secure/Multipurpose Internet Mail Extensions (S/MIME)