OSPF is configured over a Frame Relay network as shown in the exhibit. All PVCs are active.However, R1 and R3 fail to see all OSPF routes in their routing tables. The show ip ospf neighbor command executed on R2 shows the state of t he neighbors. What should be done to fix the problem? （）

• A、The ip ospf network broadcast command should be configured on each Frame Relay interface
• B、The ip ospf network non -broadcast command should be configured on each Frame Relay interface
• C、Th e ip ospf priority value on the spoke routers should be set to 0
• D、The ip ospf priority value on the hub router should be set to 0
• E、The neighbor command should be configured under the OSPF routing process on all routers