Refer to the exhibit. EIGRP has been configured on routers R1 and R2. However, R1 does not show R2 as a neighbor and does not accept routing updates from R2. What could be the cause of the problem?
Select the best response.
A.
The no auto-summary command has not been issued under the EIGRP process on both routers.
B.
Interface E0 on router R1 has not been configured with a secondary IP address of 10.1.2.1/24.
C.
EIGRP cannot exchange routing updates with a neighbor’s router interface that is configured with two IP addresses.
D.
EIGRP cannot form neighbor relationship and exchange routing updates with a secondary address.