How is a designated router elected for OSPF?

A. The DR is elected by the highest priority and highest RID in the same autonomous system.
B. The DR is elected by the lowest priority and highest RID in the same area.
C. The DR is elected by the lowest priority and lowest RID.
D. The DR is elected by the highest priority and highest RID in the same broadcast network.

D. The designated router is elected by the highest priority in the LAN. If the priorities are all the same, then the highest RID becomes the tiebreaker. OSPF will elect a DR for each broadcast network, such as a LAN. This is to minimize the number of adjacencies formed.