A company uses Routers R1 and R2 to connect to ISP1 and ISP2, respectively, with Routers I1 and I2 used at the ISPs. R1 peers with I1 and R2; R2 peers with I2 and R1. Assuming as many default s ettings as possible are used on all four routers, which of the following is true about the next - hop IP address for routes R1 learns over its iBGP connection to R2?（）

• A、The next hop is I2's BGP RID
• B、The next hop is I2's IP address used on the R2 - I2 neigh bor relationship
• C、The next hop is R2's BGP RID
• D、The next hop is R2's IP address used on the R1 - R2 neighbor relationship