Which three statements are correct regarding the OSPF operations? line (Choose three.)
A . PE5 OSPFv2 and OSPFv3 router id is 10.5.1.1
B . The OSPF virtual-link cost is 1
C . Area 3 is a transit area
D . Area 4 is using MD5 authentication
E . Area 1 IPv4 and IPv6 networks are not reachable from PE6
Answer: C,D,E