which answer is correct?

— Exhibit –

— Exhibit —
Click the Exhibit button.
Referring to the exhibit, which answer is correct?

A.
R2 is the DR and R1 is the BDR.

B.
R4 is the DR and R2 is the BDR.

C.
R2 is the DR and R3 is the BDR.

D.
R3 is the DR and R2 is the BDR.