单项选择题

A.HostbasedintrusiondetectionsoftwareB.Softwarefirewall……

Atechnicianwantstodecreasetheoverallattacksurfaceoftheserversinadatacenterthrough decreasingthenumberofopennetworkportsoneachserver.Whichofthefollowingcouldthe technicianimplementtoincreasesecurity？（）

A.Hostbasedintrusiondetectionsoftware
B.Softwarefirewall
C.NTFS
D.ACL

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