Refer to the exhibit. You are the network administrator of the Route.com company. You have been tasked to implement a hub and spoke EIGRP topology over Frame Relay to provide connectivity between the networks at headquarters and all 300 spokes. Before you begin the actual implementation, which three pieces of information are more important to know than the others?（）

• A、the Committed Information Rate of all the Frame Relay PVCs
• B、the Cisco IOS version running on all the routers
• C、the router model number of all the spoke routers
• D、the number of HQ networks connected behind  the headquarter routers
• E、the routing policy, such as whether or not the spokes can be used as backup transient point between the two headquarter routers