You install two Exchange Server 2010 Service Pack 1 (SP1) Edge Transport servers named
Edge1 and Edge2.You need to ensure that e-mail is sent only to Edge2 if Edge1 fails.
What should you do?

A.
Create two MX records. Assign the MX record for Edge1 a priority of 1. Assign the MX
record for Edge2 a priority of 5.

B.
Create two MX records. Assign the MX record for Edge1 a priority of 5. Assign the MX
record for Edge2 a priority of 1.

C.
Create two A records that use the same name. Create one MX record that uses the
FQDN of the A record. Assign a priority of 0 to the MX record.

D.
Create two CNAME records that have the same name. Create one MX record that uses
the FQDN of the CNAME records. Assign a priority of 0 to the MX record.

Explanation:
The mail exchanger (MX) resource record shows the DNS domain name for the computer or
computers that process mail for a domain. If multiple mail exchanger (MX) resource records
exist, the DNS Client service attempts to contact mail servers in the order of preference from
lowest value (highest priority) to highest value (lowest priority).