[多选] Which two of these Metro Internet services map to E-LAN services that are defined by the MEF?（）

Refer to the exhibit. Which three statements accurately describe this GLBP topology？（） Router A is responsible for answering ARP requests sent to the virtual IP address。 If Router A becomes unavailable， Router B will forward packets sent to the virtual MAC address ofRouter A。 If another router were added to this GLBP group， there would be two backup AVGs。 Router B is in GLBP listen state。 Router A alternately responds to ARP requests with different virtual MAC addresses。 Router B will transition from blocking state to forwarding state when it becomes the AVG。 影响材料最小弯曲半径的因素有哪些？ 人才流失 网上教育环境按照应用服务性质分，主要为4部分：网络教育的具体应用、网上教育资源、网上教学管理、网络硬件基础设施和教学平台。 绿泥石化 Which two of these Metro Internet services map to E-LAN services that are defined by the MEF?（）