Which of the following statements regarding the DR in an OSPF network are correct? (Choose two)

Which of the following statements regarding the DR in an OSPF network are correct? (Choose two)

A. There must be at least one DR in an OSPF area. B. A DR must be elected among the routers through the negotiations that are defined by OSPF protocol. C. Only the router with highest priority will be elected as DR. D. Only NBMA or Broadcast networks need to elect DR.