What is the cause for this misconfiguration?

Scenario
Refer to the topology. Your company has connected the routers R1, R2, and R3 with serial links. R2 and R3 are connected to the switches SW1 and SW2, respectively. SW1 and SW2 are also connected to the routers R4 and R5.
The EIGRP routing protocol is configured.
You are required to troubleshoot and resolve the EIGRP issues between the various routers.
Use the appropriate show commands to troubleshoot the issues.

Router R6 does not form an EIGRP neighbor relationship correctly with router R1. What is the cause for this misconfiguration?
A. The K values mismatch.
B. The AS does not match.
C. The network command is missing.
D. The passive interface command is enabled.

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