Which result between BGP peers R1, R2 and R1, R3 is true?

Refer to the exhibit.

R1 is directly connected to R2 and R3. R1 is in BGP AS 123, R2 is in BGP AS 2, and R3 is in BGP AS 3. Assume that there is no connectivity issue between R1, R2 and R1, R3.

Which result between BGP peers R1, R2 and R1, R3 is true?
A . The BGP session does not come up between R1 and R2 and between R1 and R3.
B . The BGP session comes up between R1 and R2 and between R1 and R3.
C . The BGP session comes up between R1 and R3, but not between R1 and R2.
D . The BGP session comes up between R1 and R2, but not between R1 and R3.

Answer: B