What are the possible causes?

Exhibit:

As shown in the figure, OSPF process 100 runs on both PEs and CEs, and VPN routers are transmitted between PE 1 and PE 2 through PGB CE 1 enables interface address 43.1.1.0/24 in area 0.A route to 43.1.10/24 .

How ever, does not exist in the routing table of CE 2 .

What are the possible causes?
A . The VPN route to 43.1.1.0/24 does not exist in the routing table of PE 2.
B . The LSDB of PE 1 does not have the type 1 LSA generated by CE 1.
C . The LSDB of PE 12 does not have the type 1 LSA generated by CE 1.
D . The public network rout to 43.1.1.0/24 does not exist in the routing table of PE2

Answer: B, D