【单选题】
A <{p}>the maximum interval between hello packets that are sent to verify that the HA functionality on the other
firewall is operational.<{/p}>
B <{p}>The time that a passive or active-secondary firewall will wait before taking over as the active or
active-primary firewall<{br/}><{/p}>
C <{p}>the timeframe within which the firewall must receive keepalives from a cluster member to know that the
cluster member is functional.<{br/}><{/p}>
D <{p}>The timeframe that the local firewall wait before going to Active state when another cluster member is
preventing the cluster from fully synchronizing<{br/}><{/p}>
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