What is a new feature of the Cisco ISR router? （）

A. Re-learn the available OSPF neighbors with neighbor relationship restart
B. Send the graceful restart message
C. Re-acquire the link state database content for the network
D. Re-learn the available OSPF neighbors without neighbor relationship restart

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