问题：

[多选]

Refer to the exhibit. Which three statements accurately describe this GLBP topology？（）

A . Router A is responsible for answering ARP requests sent to the virtual IP address
B . If Router A becomes unavailable， Router B will forward packets sent to the virtual MAC address ofRouter A
C . If another router were added to this GLBP group， there would be two backup AVGs
D . Router B is in GLBP listen state
E . Router A alternately responds to ARP requests with different virtual MAC addresses
F . Router B will transition from blocking state to forwarding state when it becomes the AVG