Which of the following are TRUE statements about the router ID in OSPF? Choose two

A.
A router ID is not required by OSPF.

B.
The system address is used as the router ID if router-id is not set.

C.
The router ID is used to uniquely identify every OSPF router.

D.
On the Alcatel-Lucent 7750 SR, the router ID is set to the highest logical IP address if
router-id is not explicitly set.