Which two OSPF network scenarios require OSPF virtual link configuration? (Choose two.)
A.
to connect an OSPF non-backbone area to area 0 through another non-backbone area
B.
to connect an NSSA area to an external routing domain
C.
to connect two parts of a partitioned backbone area through a non-backbone area
D.
to enable route leaking from Level 2 into Level 1
E.
to enable route leaking from Level 1 into Level 2
F.
to enable OSPF traffic engineering