Which of the following statements about router IDs are true? (Choose two)

A.
The routers contained in the same LSDB have the same router ID.

B.
Each router in an OSPF network must have a unique router ID.

C.
Two routers in different OSPF areas can have the same router ID.

D.
A router ID is expressed in a 32-bit dotted decimal format.

Explanation: