Which statement is true about IS-IS hello (IIH) PDUs?
A.
The same IIH PDU is used for both point-to-point and broadcast networks.
B.
IIH PDUs maintain the link-state database synchronization.
C.
IIH PDUs provide the priority value used in DIS election.
D.
IIH PDUs are transmitted only at the beginning of adjacency establishment.
Explanation: