You have an Exchange Server 2007 environment. You need to stop the circulation of an e-mail message that contains a virus within your company. What should you do?

A.
Create a transport rule on all Edge Transport servers

B.
Create a transport rule on a single Hub Transport server

C.
Create a recipient filter based on the original sender of the first message that contained the virus

D.
Run the Export-Mailbox cmdlet with the -AllContentKeywords parameter