List the true statements with regards to the OSPF Hello protocol. (Choose two)
A.
OSPF Hello protocol provides dynamic neighbor discovery
B.
OSPF Hello protocol Hello timers do not need to match between neighbors
C.
OSPF Hello protocol is used as a keep-alive to maintain neighbor adjacency
D.
OSPF Hello protocol is used to negotiate parameters to maintain neighbor relationships
E.
OSPF Hello protocol is used to exchange routing updates