Knowledge-based Intrusion Detection Systems (IDS) are more common than:基于知识库的IDS比下列哪一类IDS更常见？

A、Host-basedIDS.基于主机的IDS系统
B、Application-BasedIDS.基于应用程序的IDS系统
C、Behavior-basedIDS.基于行为的IDS系统
D、Network-basedIDS.基于网络的IDS系统