A. T1:RA.,T2:RB.,T2:WB.,T1:WA. B. T1:RB.,T1:WB.,T2:RA.,T2:WA. C. T1:RA.,T2:RB.,.T1:WA.,T2:WB. D. T2:RA.,T1:RB.,.T1:WA.,T2:WB.