what needs to be done to resolve this problem?

You are troubleshooting a problem where external routes are not being summarized into the OSPF backbone.

Referring to the exhibit, what needs to be done to resolve this problem?

A.
The area-range parameter needs to be under Area 0.

B.
The area-range parameter needs to be under the nssa hierarchy.

C.
The summaries parameter needs to be removed under the/issa hierarchy.

D.
The area-range parameter must include the override-metric parameter.

Explanation: