Your company has an Exchange Server 2010 organization. The network contains an internal root certification authority (CA).

You plan to add a disclaimer to all email messages sent by users in the company. You need to ensure that the disclaimer can be added to encrypted email messages.

What should you do?

A.
Instruct users to encrypt email messages by using IRM only.

B.
Instruct users to encrypt email messages by using S/MIME only.

C.
Enable the Content Filter agent on all of the Hub Transport servers.

D.
Modify the priority of the Transport Rule agent on all of the Hub Transport servers.