The OSPF hello protocol performs which of the following tasks?（）

• 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 witch the fastest links as the designated router
• F、It broadcasts hello packets throughout the internetwork to discover all routers that are running OSPF