Which of the following describe the process identifier that is used to run OSPF on a router?

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 globally significant.

C.
It is needed to identify a unique instance of an OSPF database.

D.
It is an optional parameter required only if multiple OSPF processes are running on the router.

E.
All routers in the same OSPF area must have the same process ID if they are to exchange
routing information.

Explanation:
https://learningnetwork.cisco.com/thread/6248
They are locally significant only, and have no bearing on the structure of any OSPF packet or LSA

update. So you can have a separate process-id on every single router in your network if you so
desire!