In an effort to decrease the size of the routing tables in the network, summarization is being configured on all routers. Where in an EIGRP network is it most appropriate to implement route summarization?
A. At area border routers
B. At autonomous system boundary routers
C. It is done automatically by the DR router in each area
D. Manually at any interface of any EIGRP router within the network
E. In backbone area routers.