What could be a reason why synchronization between primary and secondary Security Management Servers does not occur?

What could be a reason why synchronization between primary and secondary Security Management Servers does not occur?

A.
You did not activate synchronization within Global Properties.

B.
You are using different time zones.

C.
You have installed both Security Management Servers on different server systems (e. g. one machine on HP hardware and the other one on DELL).

D.
If the set of installed products differ from each other, the Security Management Servers do not synchronize the database to each other.