Refer to the exhibit. What is a possible reason that Router2 is not receiving OSPF routing updates on interface FastEthernet0/1?

- There is no OSPF network statement for the network to which interface FastEthernet0/1 belongs.
- Interface FastEthernet0/1 is configured as passive for OSPF.
- The OSPF priority of interface FastEthernet0/1 is set to zero.
- OSPF is not enabled on the neighboring router that is connected to FastEthernet0/1.
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