Which two statements describe the scenario when a router will send out a Type 4 link-state update
packet to its neighbors? (Choose two.)

A.
Type 4 link-state update packets are unicast to every neighbor on regular intervals to keep the
database consistent between neighbors.

B.
Type 4 link-state update packets are sent when the interface receives a Type 3 Link-State
Request packet from a neighbor.

C.
Type 4 link-state update packets are multicast to every neighbor on regular intervals to keep
the database consistent between neighbors.

D.
Type 4 link-state update packets are sent out to the designated router (DR) or backup
designated router (BDR) when a topology change occurs.