The OSPF Hello protocol performs which

The OSPF Hello protocol performs which of the following tasks (Choose two.)（）。

AIt provides dynamic neighbor discovery.
BIt detects unreachable neighbors in 90 second intervals.
CIt maintains neighbor relationships.
DIt negotiates correctness parameters between neighboring interfaces.
EItuses timers to elect the router with the fastest links as the designated router.
FIt broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF.

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