Which two options must be included in your DNS server to receive email from all external senders?

Q64.Your organization is deploying an ESA for email security for inbound and outbound emails. To receive inbound emails from external organizations, you must setup your DNS servers with the appropriate records so that the sending email server can determine Which email gateway to send to.

Assume that you have two ESAs deployed and the hostnames and IP address are as follows:

– esa1.myesa.com:5.5.5.25 {Preferred}

– esa2.myesa.com:5.5.5.26

Which two options must be included in your DNS server to receive email from all external senders? (Choose two)
A . Reverse Lookup Zone for 5.5.5.: 25 3600 IN PTR esa1.myese.com. 26 3600 IN PTR esa2.myesa.com.
B . Forward Lookup Zone: @ 3600 IN A 10 esa1.myesa.com @ 3600 IN A 20 esa2.myesa.com
C . Forward Lookup Zone: esa1 IN 3600 A 5.5.5.25 esa2 IN 3600 A 5.5.5.26
D . Forward Lookup Zone: @ 3600 IN MX 10 mail1.myesa.com @ 3600 IN MX 20 mail1.myesa.com
E . Forward Lookup Zone: mail1.myesa.com 120 CNAME esa1.myesa.com mail2.myesa.com 120 CNAME esa2.myesa.com

Answer: AE