Refer to the exhibit. Considering that R2, R3, and R4 are correctly configured, why did R1 not establish an adjacency with R2, R3, and R4?

- because the automatic summarization is enabled on R1
- because the IPv4 address on Fa0/0 interface of R1 is incorrect
- because the Fa0/0 interface of R1 is declared as passive for EIGRP
- because there is no network command for the network 192.168.1.0/24 on R1
Explanation: The missing routes are the result of there not being an EIGRP adjacency between R1 and R2, R3, and R4.To establish adjacency, a router must send and receive hello packets over an interface to and from its neighbors. The interface Fa0/ of the router R1 is declared as passive, so R1 will not send hello packets over its interface Fa0/0.
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