What is the most likely cause of the clustering issue?

From the output of the following cphaprob -i list, what is the most likely cause of the clustering issue?
Cluster B> cphaprob -i list
Built-in Devices:
Device Name: Interface Active Check Current state: OK
Device Name: HA Initialization Current state: OK
Device Name: Recovery Delay Current state: OK
Registered Devices:
Device Name: Synchronization Registration number: 0 Timeout: none Current state: OK Time since last report: 3651.5 sec
Device Name: Filter Registration number: 1 Timeout: none Current state: problem Time since last report: 139 sec
Device Name: routed Registration number: 2 Timeout: none Current state: OK Time since last report: 3651.9 sec
Device Name: cphad Registration number: 3 Timeout: none Current state: OK Time since last report: 3696.5 sec
Device Name: fwd Registration number: 4 Timeout: none Current state: OK Time since last report: 3696.5 sec
A. There is an interface down on Cluster A
B. There is a sync network issue between Cluster A and Cluster B
C. The routing table on Cluster B is different from Cluster A
D. Cluster B and Cluster A have different versions of policy installed.

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