A legacy OSPF network design solution historically included a large number of routers in a single backbone area 0. The network currently has over 300 OSPF routers. How is the network redesigned to allow further expansion?
A. Break down area 0 into smaller nonbackbone areas
B. Use EIGRP routing protocol instead of OSPF
C. Implement route summarization on the routers in the backbone area
D. Adjust OSPF timers to smaller values
