Which statement about OSPF multiaccess segments is true?
A.
The designated router is elected first.
B.
The designated and backup designated routers are elected at the same time.
C.
The router that sent the first hello message is elected first.
D.
The backup designated router is elected first.
The BDR is actually elected first, and is usually subsequently promoted to become the DR assuming that it has the highest priority on the link (or other tying factors) and there are no existing DRs.
https://www.ietf.org/rfc/rfc2328.txt
Section 9.4
Tks Jordan, well explained:-)