Refer to the Debug Output

Refer to the debug output. Following configuration of R2, the administrator discovers that the behavior is not as expected and performs debugging. Based on the output from the debug, what is the source of the problem?

A) R2 has configured an ACL to block the route to network 1.0.0.0
B) R2 has enabled split horizon.
C) R1 is using authentication, however R2 is not.
D) R2 is operating using RIPv2, while R1 is using RIPv1.