Which statement is true regarding failover?

Hardware failover is typically enabled by default on BIG-IP platforms that support it, especially in high availability deployments.

BIG-IP systems can be configured with both hardware failover, which uses a direct cable connection, and network failover, which uses network communication over the self-IPs, to provide redundant failover detection and signaling. Using both mechanisms ensures that if one fails, the other can still trigger a failover, enhancing overall high availability.

If the hardware failover cable is disconnected, and network failover is also configured, the devices would typically detect a communication loss and potentially both become active or trigger a failover, but it doesn't guarantee both will always assume the active state without other failover methods being considered.

Hardware failover typically detects the presence or absence of a signal or heartbeat across the dedicated cable, not voltage, and it specifically monitors the cable itself, not general traffic across the network by default.