OSPF routing uses the concept of areas. What are the characteristics of OSPF areas? ()

A.Each OSPF area requires a loopback interface to be configured.

B.Areas may be assigned any number from 0 to 65535.

C.Area 0 is called the backbone area.

D.Hierarchical OSPF networks do not require multiple areas.

E.Multiple OSPF areas must connect to area 0.

F.Single area OSPF networks must be configured in area 1.