A corporate environment includes Exchange Server 2010 deployed at the company headquarters and at a branch office. Each location includes one Mailbox server, one Client Access server, and one Hub Transport server. Each location has two Edge Transport servers in the perimeter network. The current MX record preferences and Edge Transport servers are shown in the following table.

You have the following requirements:

* Balance external email between the headquarters and branch office locations.
* Balance email delivered to each location between the location s Edge Transport servers.

You need to recommend a solution that meets the requirements.

What should you recommend?

A.
Update the MX record preference for ET-HQ02 to 10, for ET-BR03 to 10, and for ET-BR04 to 10.

B.
Update the MX record preference for ET-HQ02 to 10, for ET-BR03 to 20, and for ET-BR04 to 20.

C.
Update the MX record preference for ET-HQ02 to 10, and remove the MX records for ET-BR03 and ET-BR04.

D.
Update the MX record preference for ET-BR03 to 10, and remove the MX records for ET-HQ02 and ET-BR04.