Which statement is true?

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.