A healthy 22 yr old wants to donate kidney to brotherShe has DR3/DR6 HLABrother has DR3/DR4Donor stimulator cells are irradiated and RESPONDER cells from RECIPIENT are isolatedA mixed lymphocyte reaction is doneThe T lymphocytes that proliferate in these cultures will most likely react with which HLA type? a. DR3 b. DR6 c. DR4 d. DR3/DR4