What are three characteristics of the OSPF routing protocol?

What are three characteristics of the OSPF routing protocol? (Choose three.)

A.
It converges quickly.

B.
OSPF is a classful routing protocol.

C.
It uses cost to determine the best route.

D.
It uses the DUAL algorithm to determine the best route.

E.
OSPF routers send the complete routing table to all directly attached routers.

F.
OSPF routers discover neighbors before exchanging routing information.

Explanation:
http://docwiki.cisco.com/wiki/Open_Shortest_Path_First
http://www.sqa.org.uk/e-learning/NetInf203CD/page_10.htm