【单选题】
You work as the exchange administrator at TestKing.com. The TestKing.com network contains anExchange Server 2010 Organization that contains a number of Hub Transport servers.<br /> During the course of day you receive an instruction form management to recommend a messaging<br /> hygiene solution. Your recommendation should ensure that servers known to send spam is blocked andthat the administrative efforts are reduced.<br /> What should you do？（）
A、You should recommend to management recipient filtering.
B、You should recommend to management an IP Block list.
C、You should recommend to management IP Block list providers.
D、You should recommend to management sender filtering.
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