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

• A、It provides dynamic neighbor discovery.
• B、It detects unreachable neighbors in 90 second intervals.
• C、It maintains neighbor relationships.
• D、It negotiates correctness parameters between neighboring interfaces.
• E、It uses timers to elect the router with the fastest links as the designated router.
• F、It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF