Refer to the exhibit.
If OSPF is implemented on the network, which additional configuration is needed to allow traffic
from host 10.4.1.15/24 to host 10.1.2.20/24?
A.
A virtual link between router 2 and router 4
B.
A virtual link between router 3 and router 4
C.
A virtual link between router 2 and router 3
D.
The current design allows traffic between the two hosts.