Which of the following two are effective and simple means of employing route summarization within the Enterprise Campus network?

Which of the following two are effective and simple means of employing route summarization
within the Enterprise Campus network? (Choose two)

A.
A default route (0.0.0.0 /0) advertised dynamically into the rest of the network

B.
Route filtering to manage traffic flows in the network, avoid inappropriate transit traffic through
remote nodes, and provide a defense against inaccurate or inappropriate routing updates

C.
Use manual split horizon

D.
Use a structured hierarchical topology to control the propagation of EIGRP queries

E.
Open Shortest Path First (OSPF) stub areas