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单项选择题

You are the network administrator for The network consists of a
single DNS domain named.
You replace a UNIX server with a Windows Server 2003 computer named
TestKing1.
TestKing1 is the DNS server and start authority (SOA) for testking.com. A UNIX
server named TestKing2 is the mail server for testking.com.
You receive reports that Internet users cannot send e-mail to the testking.com
domain. The host addresses are shown in the following window.

You need to ensure that Internet users can send e-mail to the testking.com domain.
What should you do?()

A. Add an _smtp service locator (SRV) DNS record for TestKing2.
B. Add a mail exchange (MX) DNS record for TestKing2.
C. Add an alias (CNAME) record for mail.testking.com.
D. Enable the SMTP service on TestKing1.

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