Your companys e-mail domain is contoso.com. Three Edge Transport servers in your Exchange Server 2007 organization will accept Internet mail. The servers are named Exch1, Exch2, and Exch3. You need to load balance Exch2 and Exch3, and you need to configure Exch1 as a backup server. Which three MX records should you specify? (Each correct answer presents part of the solution. Choose three.)

A.
contoso.com MX preference = 10, mail exchanger = Exch1.contoso.com

B.
contoso.com MX preference = 10, mail exchanger = Exch3.contoso.com

C.
contoso.com MX preference = 10, mail exchanger = Exch2.contoso.com

D.
contoso.com MX preference = 20, mail exchanger = Exch2.contoso.com

E.
contoso.com MX preference = 20, mail exchanger = Exch1.contoso.com

F.
contoso.com MX preference = 20, mail exchanger = Exch3.contoso.com