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Refer to the exhibit. All routers’ interfaces are up/up and configured with EIGRP. For some reason one router is unable to become an EIGRP neighbor. Which router is causing the problem and what can be the cause?

Serial 1/1 on router R2 is incorrectly configured.

R3’s interfaces IP addresses are configured on wrong subnets.

Router R1 subnet mask is mismatching.

Serial 1/0 on R2 is not configured correctly, causing the entire network to not converge.

R4’s interfaces are configured on wrong subnets.

Explanation

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