If data store synchronization is to be successful, which of these must be true?

There must be a resilient path between the SteelHeads to prevent a split brain situation.

The in-path IP addresses must be reachable from each other and connected physically in-path.

The SteelHeads must be the same model and run the same RiOS version.

The master must be the same or larger data store than the backup.

The SteelHeads must be in a serial cluster arrangement.