Assuming other failover settings are at their default state, what would occur if the failover cable were to be disconnected for five seconds and then reconnected.

Loss of the failover cable does cause a state change even if network communication remains intact, because the cable provides an independent heartbeat path that both systems rely on.

The default failover timeout for serial cable voltage loss is not ten seconds; the disconnection is detected quickly and a split-brain condition is triggered within seconds.

When the dedicated failover cable loses voltage, each unit can no longer confirm the peer is alive, so both independently transition to active state - a split-brain condition. Once the cable is reconnected and voltage is restored, the systems exchange failover state information and the unit that was originally standby yields, returning the pair to a proper active/standby configuration.

While both systems do go active on disconnect, the reconnection behavior described in choice D differs from choice C in how the failover is resolved, making C the accurate description of default behavior.