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Your company has a single Active Directory domain named contoso.com. All servers run Windows Server 2008. You have a public DNS server named Server1, and an e-mail server named Server2. Client computers outside the company domain are unable to send e-mail messages to contoso.com You verify that the host (A) DNS record for Server2 is availible to external client computers. You need to ensure Server2 can receive e-mail messages from external client computers. How should you configure the contoso.com DNS zone?

A.    Add a Mail Exchange (MX) record for Server2
B.    Add a Mailbox (MB) record for Server2. Set the Mailbox Host setting to Server2
C.    Add a Canonical (CNAME) record that maps Server2 to contoso.com
D.    Add a Service Locator (SRV) record for Server2. Set the Service field to _smtp. Set the Protocol field to _tcp. Set the Port Number to 25