Refer to the outputs shown in the exhibit. 
What could be preventing the R1 router from receiving
any prefixes from the R2 BGP neighbor?
A.
R2 is using the wrong AS number in its neighbor 192.168.31.2 remote-as statement.
B.
The no sync command is missing on R2.
C.
R1 is using the wrong AS number in its neighbor 192.168.31.1 remote-as statement.
D.
The no sync command is missing on R1.
E.
Both R1 and R2 are not using a loopback address to source their BGP packets.
F.
There is a TCP session establishment problem between R1 and R2.