Refer to the exhibit.
R2 does not have R1 1.1.1.1/32 subnet in its BGP table. Which issue can be causing this problem?
A.
XR4 does not have next-hop-self for a R2 iBGP session.
B.
R2 does not have no auto-summary configured.
C.
XR4 drops any update coming from R1.
D.
IPv4 address-family is not enabled on R1.