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.

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Answer: D