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