You deploy a new Exchange Server 2010 organization.You send a test message to an external recipient and immediately receive the following nondelivery report (NDR): Delivery has failed to these recipients or groups: User1@contoso.com (user1@contoso.com). The recipient’s e-mail system isn’t accepting messages now.Please try resending this message later or contact the recipient directly.± You verify that you can succesfully send an e-mail message to User1@contoso.com from an external e-mail system.You need to ensure that you can send e-mails to external recipients from within the Exchange organization. What should you create?()
A. a Send connector
B. an accepted domain
C. an MX record
D. an SMTP site link