An administrator has configured two FortiGate devices for an HA cluster. While testing the HA failover, the administrator notices that some of the switches in the network continue to send traffic to the former primary unit. The administrator decides to enable the setting link-failed-signal to fix the problem. Which statement about this command is true?

A. It forces the former primary device to shut down all its non-heartbeat interfaces for one second while the failover occurs.
B. It disables all the non-heartbeat interfaces in all the HA members for two seconds after a failover.
C. It sends a link failed signal to all connected devices.
D. 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.
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