Refer to the exhibit. Router 1 is missing the route for the router 2 loopback 0. What should the engineer change to fix the problem?
A. Router 1 to be an ABR
B. the wildcard mask network statement in OSPF of Router 2
C. the hello timers on Router 1 and Router 2 to be different
D. the area numbers on Router 1 and Router 2 to be similar
Correct Answer: D