Which of these recommended designs provides the highest availability？（）

• A、 map the Layer 2 VLAN number to the Layer 3 subnet
• B、 control route propagation to edge switches using distribute lists
• C、 use a Layer 2 distribution interconnection link with HSRP or GLBP
• D、 use a Layer 3 distribution interconnection link with HSRP or GLBP
• E、 use equal-cost Layer 3 load balancing on all links to limit the scope of queries in EIGRP