What is the purpose of IP Event Dampening?（）

• A、to configure a subinterface so that it can be applied to the primary interface in order to prevent exponential selective dampening
• B、to suppress the effects of excessive interface flapping events on routing protocols and routing tables in the network
• C、to introduce a nonconfigurable exponential delay mechanism
• D、to allow the network operator to configure a router to automatically dampen and selectively identify a local interface that is failing