Refer to the exhibit. 
Which statement is true?
A.
BGP peer 10.1.2.3 is performing inbound filtering.
B.
BGP peer 10.1.2.3 is a route reflector.
C.
R1 is a route reflector, but BGP peer 10.1.2.3 is not a route reflector client.
D.
R1 still needs to send an update to the BGP peer 10.1.2.3.