Which three statements about OSPF areas are true? (Choose three.)

A.
Areas introduce a boundary on the link-state updates.

B.
Areas are logical definitions specific to any given router.

C.
All routers within an area have the exact link-state database.

D.
The calculation of the Dijkstra algorithm on a router is limited to changes within an area.

E.
The area designated router will always have a priority of 0.

Explanation:
Reference:
http://www.cisco.com/en/US/tech/tk365/technologies_white_paper09186a0080094e9e.shtml
(areas and border routers)