Refer to the exhibit. A network engineer manually reconfigures the BGP configuration on newly upgraded router R1. However, the BGP neighbor relationship does not come up with the directly connected neighbor router. What is causing the failure of the BGP neighbor relationship between routers R1 and R2?
A. An incorrect neighbor IP address for router R2 is configured on router R1.
B. An incorrect neighbor AS number is configured on router R1 for router R2.
C. The wrong BGP authentication password is configured on router R1.
D. Router R1 must configure the R2 loopback address as the neighbor IP address.
