In which two circumstances is Diameter Peer Discovery needed? (Choose two.)
A. The Diameter client is rejected by the peer.
B. The Diameter client must contact a first-hop Diameter agent.
C. The Diameter agent must reply to the connect request of a Diameter client.
D. The Diameter agent must search the next agent so that Diameter messages can reach the Diameter server.
E. The Diameter agent must close the session with a Diameter client.
