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Refer to the exhibit. A Full-mesh frame relay topology network with OSPF enabled and interfaces is properly configured. OSPF routes appear in the Link State database of all the routers but network 10.10.20.0/24 does not appear in neighbor table of router R3 and network 10.10.30.0/24 does not appear in neighbor table of router R2. What can be the source of the problem?

The DLCI 101 is in inactive state.

IP ospf network is not configured as "broadcast"

Either serial interface on routers R2 or R3 must be down.

Router R1 interfaces are configured as point-to-point.

IP addressing is not properly configured.

Explanation

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