Refer to the exhibitcompany xyz has 150 branch location across the U.

Refer to the exhibit

company xyz has 150 branch location across the U.S. Each branch is connected to two aggregation router one router in each data center The network is configured with Multiple OSPF with multiple OSPF areas and the aggregation router 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 elements should be included on the aggregation router?