You are the administrator of the large OSPF network and are considering dividing it to multiple areas.What are two advantages of configuring multiple OSPF areas（）？

A.It eliminates the need for a DR or BDR in the OSPF network.
B.It eliminates security concerns by segregating portions of the network.
C.Type 1 and 2 LSAs are confined to a single area，reducing routing overhead.
D.Area members have smaller topological databases than if the network was one large area，requiring less CPU to derive routes。