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

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

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

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

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

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

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

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

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