Which of the following describe the process identifier that is used to run OSPF on a router? (Choose two.)
A. It is locally significant.
B. It is needed to identify a unique instance of an OSPF database.
C. All routers in the same OSPF area must have the same process ID if they are to exchange routing information.
D. It is globally significant.
E. It is an optional parameter required only if multiple OSPF processes are running on the router.
Answer: A,B