问题：

[单选]

You work as the enterprise exchange administrator at TestKing.com. TestKing.com makes use of
Microsoft Exchange Server messaging solution. The TestKing.com network consists of a single ActiveDirectory domain named testking.com. TestKing.com contains two global catalog servers and one DNSserver.
During the course of the day you receive an instruction from the CIO to deploy Exchange Server 2010 intothe environment. 
In order to accomplish this you need to propose a DNS implementation that will providesredundancy in the event of a DNS server failure. （）

A . The test option is to use multiple MX records.
B . The test option is to use integrated DNS and WINS.
C . The test option is to use Active Directory integrated DNS Server.
D . The test option is to use DNS forwarding.