Two customers have routers that run OSPF and belong to the same OSPF area. These two
routers are connected by an MPLS backbone and by a low-bandwidth point-to-point link (used as
a backup link). Which two minimum configurations are required to connect these two routers?
(Choose two.)

A.
site-of-origin

B.
sham-link

C.
domain tag

D.
down bit

E.
link cost

F.
virtual-link