單項選擇題What is the purpose of an explicit "deny any" statement at the end of an ACL?()

A.none,since it is implicit
B.to enable Cisco IOS IPS to work properly;however,it is the deny all traffic entry that is actually required
C.to enable Cisco IOS Firewall to work properly;however,it is the deny all traffic entry that is actually required
D.to allow the log option to be used to log any matches
E.to prevent sync flood attacks
F.to prevent half-opened TCP connections


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