You need to configure the DNS server to allow delivery of e-mail messages. Which four actions should you perform？（）

A.Create a host （A） resource record for EX1.fourthcoffee.com on the internal DNS Server

B.Create a host （A） resource record for EX1.fourthcoffee.com on the external DNS Server

C.Create a host （A） resource record for EX3.fourthcoffee.com on the internal DNS Server

D.Create a host （A） resource record for EX3.fourthcoffee.com on the external DNS Server

E.Create a mail exchange （MX） resource record for EX1.fourthcoffee.com on the external DNS server. Set the preference to 10

F.Create a mail exchanger （MX） resource record for EX1.fourthcoffee.com on the internal DNS server. Set the preference to 10

G.Create a mail exchanger （MX） resource record for EX3.fourthcoffee.com on the external DNS server. Set the preference to 20

H.Create a mail exchanger （MX） resource record for EX3.fourthcoffee.com on the internal DNS server. Set the preference to 20