What actions are performed when the Huawei USG6000 series switches between active and standby switches in a dual-system hot backup deployment?
A . USG_B sends gratuitous ARP packets
B . USG_B sends proxy ARP packets
C . VRRP backup group virtual address is unavailable
D . After the related switch receives the ARP packet, it refreshes the MAC address table and directs traffic to the USG_
Answer: AD