单项选择题

You need to configure the DNS resource records for incoming e-mail messages from the Internet. What should you do？（）

A.Configure mailbox （MB） resource records in the external DNS domain. Configure each record so that it has the same refresh interval
B.Configure mailbox （MB） resource records in the external DNS domain. Configure each record so that it has the same default Time to Live （TTL） interval
C.Configure mail exchanger （MX） resource records in the external DNS domain. Configure each record to have the same preference and a different mail exchanger
D.Configure mail exchanger （MX） resource records in the external DNS domain. Configure each record to have the same preference and the same mail exchanger

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