Refer to the Exhibit

Multiple Choice

Refer to the exhibit. Company XYZ has 150 branch locations across the U.S. Each branch is connected to two aggregation routers, one router in each data center. The network is configured with multiple OSPF areas, and the aggregation routers are ABRs. A requirement is to keep an optimal path to the data centers and, at the same time, reduce the LSA propagation and SPF recomputation during a change in any part of the network. Which design element should be included on the aggregation routers?

A) OSPF totally stubby area
B) OSPF summarization
C) distribute lists
D) OSPF NSSA