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