An administrator has configured two FortiGate devices for an HA cluster. While testing HA failover, the administrator notices that some of the switches in the network continue to send traffic to the former primary device. The administrator decides to enable the setting link-failed-signal to fix the problem. Which statement about this setting is true?
A. It sends an ARP packet to all connected devices, indicating that the HA virtual MAC address is reachable through a new master after a failover.
B. It sends a link failed signal to all connected devices.
C. It disabled all the non-heartbeat interfaces in all HA members for two seconds after a failover.