Refer to the exhibit. Why are routers R1 and R2 not able to establish an OSPF adjacency?​

Question:
Refer to the exhibit. Why are routers R1 and R2 not able to establish an OSPF adjacency?​

• The serial interfaces are not in the same area.
• The process numbers are not the same in both routers.
• A backbone router cannot establish an adjacency with an ABR router.
• The router ID values are not the same in both routers.

Explanation: On router R1, the network 192.168.10.0/30 is defined in the wrong area (area 1). It has to be defined in area 0 in order to establish adjacency with router R2, which has the network 192.168.10.0/30 defined in area 0.

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